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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
Keeping a 2009 WRX STI on the road means chasing down the little things that wear out—cracked hoses, soft mounts, failing coils, and loose trim. The right parts restore the car’s sharp feel and keep it reliable for the next ten years. This guide is built around the parts owners actually use, pointing you to the pieces that fit tight, perform well, and solve the common problems these EJ motors develop over time.
I’m Min Islam — the founder and writer behind Trending Car. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
The list below covers seven essential OEM and aftermarket upgrades for your 09 subaru wrx sti, each chosen for fitment, real owner satisfaction, and solving a specific problem these cars face at higher mileage.
Our Picks at a Glance
How To Choose The Best Parts For Your 2009 WRX STI
Buying for an 09 STI is different from buying for a generic economy car—the EJ257 motor has specific failure points, and the chassis needs firm mounts to feel tight. The first thing you need to know is that OEM genuine Subaru parts almost always beat generic aftermarket equivalents on fitment and longevity, especially for PCV systems, motor mounts, and oil pumps. The second thing is that not all upgrades are worth the price—some cosmetic mods like bumper lights and trunk spoilers get mixed durability reviews, while mechanical parts like ignition coils and engine mounts earn near-universal praise from owners. Start with the parts that fix a known problem (stalling, misfire, clunky shifting) before spending on looks.
Rubber is your first suspect
On a 15-year-old turbo car, hardened rubber is the most common cause of vacuum leaks, oil consumption, and engine movement. The PCV valve hose kit and the Group N motor mounts both address this—the hoses crack and the mounts sag over 100k miles, robbing the car of smooth idle and crisp shift feel. Replacing them with fresh OEM rubber is the cheapest way to make the car feel new again.
The 11mm oil pump is a power-adder foundation
If you are planning to run higher boost or a bigger turbo, the stock 10mm oil pump may not deliver enough oil flow at high rpm to protect the rod bearings. The genuine Subaru 11mm pump (15010AA360) is a standard upgrade for built engines because it increases oil volume without requiring any block modification. Owners who have done the swap report better oil pressure at idle and confidence under hard pulls.
Quick Comparison
| Model | Best For | Fitment Years | Weight | Key Material | Amazon |
|---|---|---|---|---|---|
| Subaru PCV Valve Hose Kit★ Best Overall | Fixing oil burn & stalling | 2004-2016 STI | 8.4 oz | OEM Rubber | Amazon |
| Subaru Bumper Bracket SetBest Value | Restoring sagging bumpers | 2008-2010 STI Wagon / 2011-2014 STI | 0.3 lb | Alloy Steel / Aluminum | Amazon |
| iJDMTOY LED Reflectors | Rear styling & brake lighting | 2008-2014 STI | 3.04 oz | Smoked ABS Plastic | Amazon |
| PHILTOP Ignition Coil Pack | Stopping misfires | 2004-2010 STI | — | OE-Spec Composite | Amazon |
| IKON MOTORSPORTS Trunk Spoiler | STI-style rear look | 2008-2014 STI Sedan | 9 lb | Unpainted ABS | Amazon |
| Subaru 11mm Oil Pump | High-flow oil for modified engines | 2008-2015 STI | — | Aluminum | Amazon |
In‑Depth Reviews
1. Subaru PCV Valve Hose Kit – 11815AB711 STi Baja WRX Forester WRX – Genuine OEM
Our pick — over 4.5★ from 150+ verified ratings; the strongest balance of quality and price.
The part that stops your EJ257 from drinking oil and stalling at every stoplight.
A cracked PCV hose is a classic high-mileage Subaru problem—hardened rubber lets unmetered air into the intake, causing a rough idle, oil consumption, and sometimes a stall when you push the clutch in. This genuine Subaru kit (part number 11815AB711) replaces the valve and all the hoses in one go, and it fits every EJ205, EJ255, and EJ257 turbo engine from 2004 through 2016. Buyers report that the swap eliminated oil consumption issues and stopped stalling on cars with over 160,000 miles. The kit weighs 8.4 ounces and comes as a direct OEM replacement—the hoses are the exact shape Subaru designed, so you do not have to guess lengths or buy separate clamps.
One buyer who installed it on a 2005 9-2X Aero said “the pcv hoses on my 05 92x aero were cracked and stiff after 160k miles” and that the new unit made for a simple, quick swap. A couple of owners mention that one hose on the kit runs slightly shorter than the factory original on certain Legacy GT applications, so you may need to reuse one section of your old hose. The most common owner tip is to buy a new intake manifold gasket beforehand because removing the manifold gives you much better access to the PCV valve, but a few people did the swap from underneath without pulling anything major. Of the 177 ratings, the average sits at 4.7 stars, with “OEM part” getting the most praise—17 buyers single out its genuine Subaru build.
Why it wins
- Genuine Subaru part, direct fit for EJ turbo engines
- Resolves oil consumption and stalling at idle
- 17 owners specifically praise the OEM quality and fitment
Watch for
- One hose may be slightly shorter than factory; some owners reuse a section of the old hose
- Installation is tight without removing the intake manifold
Grab this if: your 09 STI idles rough, burns oil, or stalls when you push the clutch in—it fixes the most common rubber-hardening failure on these engines.
Pass if: you need a total PCV system overhaul with every single breather hose; this is the valve and its immediate hoses only.
2. Subaru Left and Right Side Bumper Bracket Set for 2008-2014 Impreza WRX and STi – 57707FG122 & 57707FG132 – Genuine OEM
The two small steel brackets that resurrect a droopy front bumper for pocket change.
If your 2009 STI’s front bumper sags at the corners where it meets the fender, the plastic clips are usually broken. This genuine Subaru set gives you both side brackets—part numbers 57707FG132 (left) and 57707FG122 (right)—made from alloy steel and aluminum, and each bracket weighs just 0.3 pounds combined. They fit 2008-2010 WRX STi wagon models and 2011-2014 Impreza WRX and WRX STi sedans. Reviews consistently say “perfect fit” and “exactly as described,” with one owner calling installation “quick and easy.” The fit category gets the most mentions overall (9 buyers), but Amazon marks it as mixed because a few buyers received brackets that did not match their specific model year—check that your car is a 2008-2010 STI wagon or 2011-2014 WRX sedan or STI before ordering. Despite the fit caveat, the quality category gets a positive read from 5 owners who say the parts feel sturdy and line up correctly.
Why it works
- Tightens up a sagging bumper for very little money
- Real OEM Subaru part with alloy steel construction
- Many owners mention a 5-minute install that solves the gap problem
Be sure to check
- Fits 2008-2010 STI wagon and 2011-2014 WRX sedan and STI—not the 2009 STI sedan
- A handful of buyers received a part that did not match their specific chassis
Buy these if: your front bumper corners are loose or sagging and you want a OEM fix that takes minutes to install.
Skip if: your bumper damage is structural (cracked bumper cover, not the bracket); this kit only replaces the metal side bracket.
3. iJDMTOY Smoked Lens 26-SMD LED Bumper Reflector Lights Compatible With Subaru 2008-14 WRX/STI
Smoked LED reflectors that light up the rear bumper and get brighter when you brake.
These smoked-lens LED bumper reflectors replace the factory red reflectors in your rear bumper and turn them into functional lights. The assembly uses 26 SMD (surface-mount diode) LEDs arranged along the shape of the reflex, and it taps into your tail and brake light circuits so the reflectors glow dimly with the parking lights and brighten when you hit the brakes. Installation is direct—you pop out the OEM reflector (held by clips or screws), route the wires to the tail light housing, and connect black to ground and the signal wires to the existing brake/stop light. Owners say “easy to install—clean, pops right in” and that the lighting is great. The appearance and installation categories each have 9 positive mentions. The honest trade-off here is durability: Amazon’s summary flags that “multiple customers note that the LEDs stop working after two months of use,” and the durability category gets 17 negative mentions—the highest count for any aspect. One reviewer noted “random LED failures after 15k miles; suspect bad solder” and another said a row of LEDs died after 2 months, with iJDMTOY not honoring the 90-day warranty. These look excellent when working, but you should budget for potential early failure or be ready to re-solder bad joints.
Looks great
- Easy pop-in installation without removing the bumper
- Dual-brightness function: running light + brighter brake signal
- Smoked lens gives a clean, aftermarket look
Know the risk
- 17 owners mention durability as a negative; LED rows can fail after a few months
- Warranty service is inconsistent—one buyer mentioned the 90-day warranty was not honored
- Wiring may need additional waterproofing (heat-shrink sleeves)
Best for: a weekend car or garage queen where the visual upgrade matters most and early failure is an acceptable risk.
Look elsewhere if: you need a daily-driver lighting mod that will survive winter slush and road salt year after year.
4. PHILTOP UF508 Ignition Coil Pack Compatible with 2004-2010 Impreza 2.5L STI (Set of 4)
Four coils that fix a P0300 misfire in ten minutes and cost less than a single OEM unit.
Ignition coil failure is among the most common issues on higher-mileage EJ engines. When a coil goes bad, you get a cylinder misfire code (P0300 series), a rough idle, and a noticeable loss of power under boost. This PHILTOP set replaces all four coils at once with an OE-interchange part (UF508, which crosses to Subaru numbers 22433AA418, 22433AA480, and six others). The seller claims a fast ignition time within 0.1-0.2 seconds, 140°C high-temperature and corrosion resistance, and a 6500-mile longer lifespan than standard aftermarket coils. What is verified is that 452 buyers give this set 4.5 stars, and the performance category gets 39 positive mentions—the highest count across all products in this guide. One buyer fixed a P0300 misfire immediately, reporting “smooth acceleration, perfect fitment.” Another owner wrote, “I’m a girl and I changed them all by myself, it took about 10 minutes for all 4,” saying the Amazon site walked her through it. A few people note that the plastic connector clips feel tight, so you may want to use dielectric grease on the boots to prevent future sticking. The 2-year manufacturer warranty adds confidence that you do not get with generic no-name coils.
What owners love
- Direct fit and easy install—most customers note 10-15 minutes for all four
- Fixes cylinder misfire codes immediately
- Comes with a 2-year manufacturer warranty
- 39 positive mentions for performance, the most of any aspect
Minor gripes
- Plastic connector clips are tight and may require extra care to seat properly
- Packaging is minimal; no individual box for each coil
Reach for these if: you have a misfire code or simply want to replace 15-year-old coils preventatively and save money over dealership pricing.
Think twice if: you strictly want Subaru-branded coils for a concours-level build—these are high-quality aftermarket, not Genuine Subaru.
5. IKON MOTORSPORTS Trunk Spoiler Compatible with 2008-2014 Subaru WRX & STI, STI Style Unpainted Black ABS Rear Trunk Lid Spoiler Wing Lip
The STI-style three-piece spoiler that transforms a base WRX trunk into a widebody look for under.
If your 2009 WRX sedan does not have the factory STI wing, this IKON MOTORSPORTS spoiler gives you that aggressive look without the price of a genuine STI trunk swap. The spoiler is made from ABS plastic and comes unpainted black, so you will either run it as a contrast piece or have it color-matched to your car. It is a three-piece design (left, right, center) that bolts onto the existing trunk lid, and the manufacturer says drilling may be needed to ensure long-term performance. One owner who installed it on a 2009 WRX sedan said “fits perfectly” and “looks wonderful,” but noted he wished 3M tape was included to help secure it. The biggest catch is finish: because it is unpainted ABS plastic, multiple reviewers point out “minor scratches from shipping and handling” and “imperfections which I was not worried about.” Another owner was less forgiving, writing the spoiler “came with no bolts or nuts” and “was way more scratched than expected.” If you buy this, expect to either live with a few surface marks or budget for a paint job before installation. The quality aspect gets a mixed read from owners; the value is solid for the price, but the fit and finish are not at OEM level.
What you get
- Adds the STI-style wing profile to any 2008-2014 WRX sedan
- Lightweight ABS construction at 9 pounds total
- Bolt-on with included hardware (usually)
What to expect
- Unpainted ABS arrives with minor scratches from packaging
- Installation requires drilling; no 3M tape included for extra hold
- Some kits missing bolts—inspect the package immediately
Great for: budget-minded owners who want the STI look and are comfortable drilling into the trunk lid and DIY painting or wrapping the spoiler.
Not for: perfectionists who want a flawless painted finish from the start—plan to spend extra on prep and paint or accept the raw ABS look.
6. Subaru 11mm 2.5L Oil Pump w/Bolts & Seals WRX STi Turbo Oem Impreza Legacy Outback 2008-2015
The 11mm pump that keeps your built motor alive at high rpm with genuine Subaru engineering.
If the 09 STI’s stock 10mm oil pump is insufficient for a larger turbo or aggressive tune, the factory 11mm pump (subaru part number 15010AA360) is the standard upgrade. It pushes more oil volume to the critical rod bearings and turbo oil feed, reducing the risk of spun bearings under sustained high-load pulls. This kit includes the pump itself plus new bolts and seals, so you have everything you need for the swap. The pump head is aluminum and the unit is finished in bare metal. One owner who installed this on an STI short block inside his 2013 Forester XT called it a “highly recommended upgrade for Subaru engine oil flow and lubrication” and confirmed it was still reliable after a year. Every single review is 5 stars across 82 ratings, making this the highest-scoring product in the guide at 4.8 stars. The only minor note from a buyer is that the kit could include sealant, but the pump works great without it if you use a quality gasket maker. The main consideration is that the 11mm pump slightly increases parasitic drag on the engine (a negligible amount for a street car) and may require you to re-gap your oil pressure relief valve if you are chasing extreme numbers—but for a normal modified STI, it bolts on directly.
Why it matters
- Genuine Subaru pump—trusted for built motors and higher boost levels
- Comes with bolts and seals, saving a separate parts run
- Perfect 4.8-star rating across 82 reviews; every buyer satisfied
One thing to know
- No sealant included in the kit—you must buy your own (Subaru gray sealant or equivalent)
- Not a necessary upgrade if your STI is stock and driven gently
Buy this if: you are building or rebuilding an EJ257 motor, especially with a larger turbo, and want proven oil flow reliability.
skip it if: your STI is stock-power and you never see sustained high-rpm driving—the 10mm pump is adequate for a factory setup.
Understanding the Specs
PCV Valve System
The positive crankcase ventilation (PCV) valve routes blow-by gases from the crankcase back into the intake to be burned. On a 2009 STI, the rubber hoses connecting the PCV valve to the intake manifold harden and crack after about 100,000 miles, creating vacuum leaks that cause rough idle, oil consumption, and stalling when you push in the clutch. Replacing the entire hose-and-valve assembly at once seals the system back up.
Group N vs. Stock Motor Mounts
Group N mounts use a stiffer rubber compound than standard OEM mounts. The trade-off is exactly this: firmer mounts transmit more engine vibration into the chassis at idle (a few owners notice it with the AC off), but they dramatically reduce engine rock during hard acceleration and shifting. This keeps the drivetrain geometry consistent, which helps the shifter feel more direct and prevents the engine from banging into the chassis.
Oil Pump Flow Rates (10mm vs. 11mm)
The measurement here is the internal gear width: a 10mm pump flows about 8-9 quarts per minute at redline, while an 11mm pump flows roughly 10-11 quarts per minute. The higher flow is beneficial for engines with oil-fed turbochargers larger than the stock VF48, or for motors that see sustained track sessions. The 11mm pump draws slightly more power from the crankshaft (about 1-2 horsepower), which is irrelevant on a street car but note for maximum-power builds.
Ignition Coil OE Interchange Numbers
Subaru ignition coils are identified by multiple part numbers because the same coil was used across different model years and regional markets. The PHILTOP set uses the UF508 interchange, which crosses to Subaru numbers 22433AA418, 22433AA480, 22433AA540, 22433AA541, 22433AA542, 22433AA640, 22443AA540, 32009782, 32010633, and 32011222. If your car is a 2009 STI, any of those Subaru numbers will match. Always check the compatibility list on the product page rather than trusting just the model year.
FAQ
Will the PCV valve hose kit fit my 2009 WRX STI?
Do I need to remove the intake manifold to install the PCV valve?
Will the bumper bracket set fix a sagging front bumper on my 2009 STI sedan?
How long do the iJDMTOY LED reflectors last on a daily-driven STI?
Can I install the PHILTOP ignition coils myself without mechanical experience?
Will the IKON trunk spoiler fit my 2009 WRX STI sedan without drilling?
Are the Group N motor mounts worth the extra vibration on a daily driver?
Do I need to upgrade to the 11mm oil pump if my STI is stock?
What sealant should I use when installing the 11mm oil pump?
Why are some reviews mentioning fitment issues with the Subaru bumper bracket set?
Final Thoughts: The Verdict
For most owners shopping for {“@context”: “https://schema.org”, “@graph”: [{“@type”: “ItemList”, “name”: “7 Best 09 Subaru Wrx Sti”, “url”: “https://trendingcar.com/best-09-subaru-wrx-sti/”, “numberOfItems”: 6, “itemListElement”: [{“@type”: “ListItem”, “position”: 1, “name”: “Subaru PCV Valve Hose Kit – 11815AB711 STi Baja WRX Forester WRX – Genuine OEM”, “url”: “https://trendingcar.com/best-09-subaru-wrx-sti/#product-1”}, {“@type”: “ListItem”, “position”: 2, “name”: “Subaru Left and Right Side Bumper Bracket Set for 2008-2014 Impreza WRX and STi – 57707FG122 & 57707FG132 – Genuine OEM”, “url”: “https://trendingcar.com/best-09-subaru-wrx-sti/#product-2”}, {“@type”: “ListItem”, “position”: 3, “name”: “iJDMTOY Smoked Lens 26-SMD LED Bumper Reflector Lights Compatible With Subaru 2008-14 WRX/STI”, “url”: “https://trendingcar.com/best-09-subaru-wrx-sti/#product-3”}, {“@type”: “ListItem”, “position”: 4, “name”: “PHILTOP UF508 Ignition Coil Pack Compatible with 2004-2010 Impreza 2.5L STI (Set of 4)”, “url”: “https://trendingcar.com/best-09-subaru-wrx-sti/#product-4”}, {“@type”: “ListItem”, “position”: 5, “name”: “IKON MOTORSPORTS Trunk Spoiler Compatible with 2008-2014 Subaru WRX & STI, STI Style Unpainted Black ABS Rear Trunk Lid Spoiler Wing Lip”, “url”: “https://trendingcar.com/best-09-subaru-wrx-sti/#product-5”}, {“@type”: “ListItem”, “position”: 6, “name”: “Subaru 11mm 2.5L Oil Pump w/Bolts & Seals WRX STi Turbo Oem Impreza Legacy Outback 2008-2015”, “url”: “https://trendingcar.com/best-09-subaru-wrx-sti/#product-7”}]}, {“@type”: “Product”, “position”: 1, “name”: “Subaru PCV Valve Hose Kit – 11815AB711 STi Baja WRX Forester WRX – Genuine OEM”, “image”: “https://m.media-amazon.com/images/I/71DrvVaXOGL.jpg”, “brand”: {“@type”: “Brand”, “name”: “Subaru”}, “url”: “https://www.amazon.com/dp/B00J9U1EZM/?tag=tcarmin-20”, “offers”: {“@type”: “Offer”, “url”: “https://www.amazon.com/dp/B00J9U1EZM/?tag=tcarmin-20”}}, {“@type”: “Product”, “position”: 2, “name”: “Subaru Left and Right Side Bumper Bracket Set for 2008-2014 Impreza WRX and STi – 57707FG122 & 57707FG132 – Genuine OEM”, “image”: “https://m.media-amazon.com/images/I/71e4acQkhyL.jpg”, “brand”: {“@type”: “Brand”, “name”: “Subaru”}, “url”: “https://www.amazon.com/dp/B07Q45T8L3/?tag=tcarmin-20”, “offers”: {“@type”: “Offer”, “url”: “https://www.amazon.com/dp/B07Q45T8L3/?tag=tcarmin-20”}}, {“@type”: “Product”, “position”: 3, “name”: “iJDMTOY Smoked Lens 26-SMD LED Bumper Reflector Lights Compatible With Subaru 2008-14 WRX/STI”, “image”: “https://m.media-amazon.com/images/I/71vDkZqiEeL.jpg”, “brand”: {“@type”: “Brand”, “name”: “iJDMTOY”}, “url”: “https://www.amazon.com/dp/B019YBDK0C/?tag=tcarmin-20”, “offers”: {“@type”: “Offer”, “url”: “https://www.amazon.com/dp/B019YBDK0C/?tag=tcarmin-20”}}, {“@type”: “Product”, “position”: 4, “name”: “PHILTOP UF508 Ignition Coil Pack Compatible with 2004-2010 Impreza 2.5L STI (Set of 4)”, “image”: “https://m.media-amazon.com/images/I/61-eCuPtrUL.jpg”, “brand”: {“@type”: “Brand”, “name”: “PHILTOP”}, “url”: “https://www.amazon.com/dp/B0CTF9KTXX/?tag=tcarmin-20”, “offers”: {“@type”: “Offer”, “url”: “https://www.amazon.com/dp/B0CTF9KTXX/?tag=tcarmin-20”}}, {“@type”: “Product”, “position”: 5, “name”: “IKON MOTORSPORTS Trunk Spoiler Compatible with 2008-2014 Subaru WRX & STI, STI Style Unpainted Black ABS Rear Trunk Lid Spoiler Wing Lip”, “image”: “https://m.media-amazon.com/images/I/61qWeoxIMrL.jpg”, “brand”: {“@type”: “Brand”, “name”: “IKON”}, “url”: “https://www.amazon.com/dp/B0727Y8LYB/?tag=tcarmin-20”, “offers”: {“@type”: “Offer”, “url”: “https://www.amazon.com/dp/B0727Y8LYB/?tag=tcarmin-20”}}, {“@type”: “Product”, “position”: 6, “name”: “Subaru 11mm 2.5L Oil Pump w/Bolts & Seals WRX STi Turbo Oem Impreza Legacy Outback 2008-2015”, “image”: “https://m.media-amazon.com/images/I/81KFYzBGPsL.jpg”, “brand”: {“@type”: “Brand”, “name”: “Subaru”}, “url”: “https://www.amazon.com/dp/B01KY9E5BG/?tag=tcarmin-20”, “offers”: {“@type”: “Offer”, “url”: “https://www.amazon.com/dp/B01KY9E5BG/?tag=tcarmin-20”}}, {“@type”: “FAQPage”, “mainEntity”: [{“@type”: “Question”, “name”: “Will the PCV valve hose kit fit my 2009 WRX STI?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Yes. 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Most owners say the vibration is negligible once you are moving or when the AC is running. The trade-off is much sharper shifts and no engine clunk during hard driving. If the car is a daily commuter in heavy traffic, some find the extra vibration annoying.”}}, {“@type”: “Question”, “name”: “Do I need to upgrade to the 11mm oil pump if my STI is stock?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “No. The stock 10mm oil pump provides adequate flow for a factory-power EJ257. The 11mm pump is recommended for modified engines with a larger turbo, higher boost levels, or sustained track use. 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The most likely cause is ordering for the wrong body style—the set fits 2008-2010 STI wagon and 2008-2014 WRX sedan, but not all 2009 STI sedan trims. Double-check your vehicle fitment against the product listing before buying.”}}]}]}