Optimize your Subaru STI 2004-2007 engine's performance with a comprehensive range of top-quality aftermarket parts from industry-leading brands. Elevate the power and efficiency of your vehicle with ETS, HKS, Perrin, Mishimoto, AMS, Grimmspeed, Cobb, Remark, PLM, Turbosmart, IAG Performance, and more. Enhance airflow and filtration through AIR INTAKE DUCTS and COLD AIR INTAKES, while maintaining engine cleanliness with AIR OIL SEPARATORS and CATCH CANS. Experience impeccable control and responsiveness with BLOW OFF VALVES and BOOST CONTROL SOLENOID COVERS, complemented by the reliability of ENGINE MOUNTS and meticulously crafted ENGINE MANAGEMENT HARNESSES. Simplify maintenance and improve overall performance with DIPSTICKS and explore comprehensive ENGINE PACKAGE DEALS for a holistic approach to upgrading your Subaru WRX's engine. Unleash the full potential of your vehicle through precision-engineered components designed to deliver both power and durability, all meticulously designed to give your Subaru STI the edge on the road or track.
Subaru STI 2004-2007 Engine Parts
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Up to $129 off
In StockTomei 02-07 WRX/STI Expreme Titanium Cat Back Exhaust
Only 5 leftRegular price $1,161.00Sale price $1,161.00 Regular priceUnit price per$1,290.00 -
Up to $92.98 off
In StockTurboXS RFL Blow Off Valve
Fits: 02-07 WRX, 04-21 STI
Regular price $232.00Sale price $232.00 Regular priceUnit price per$324.98 -
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](//jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012.jpg?v=1625804898&width=220)
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](//jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012-2.jpg?v=1625804898&width=220)
GrimmSpeed Alternator Cover Black | 099012
Fits: 02-14 WRX / 04-21 STI
Regular price $135.00Sale price $135.00 Regular priceUnit price per$135.00 -
![GrimmSpeed [02-14 WRX, 04-21 STI] TGV to Engine Gasket Pair | 032001](//jdmuscleusa.com/cdn/shop/products/grimmspeed-tumbler-to-engine-gaskets-for-subaru-gasket-032001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-032001.jpg?v=1614517838&width=220)
GrimmSpeed TGV to Engine Gasket Pair | 032001
Fits: 02-14 WRX, 04-21 STI
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
Killer B Motorsport 02-14 WRX / 04-21 STI 4-1 Holy Header Exhaust Manifold 2 Bolt | HH-2BOLT
Regular price $1,539.00Sale price $1,539.00 Regular priceUnit price per$1,539.00 -
![Subaru OEM Tumbler to Engine Gasket [WRX/STI Subaru EJ Turbo Models] | 14035AA421](//jdmuscleusa.com/cdn/shop/products/subaru-oem-tumbler-to-engine-gasket-wrx-sti-subaru-ej-turbo-models-2002-2020-14035aa421-intake-system-gaskets-subaru-oem-sub14035aa421.jpg?v=1614543684&width=220)
Subaru OEM Tumbler to Engine Gasket | 14035AA421
Fits: WRX/STI Subaru EJ Turbo Models
Regular price $5.88Sale price $5.88 Regular priceUnit price per$5.88 -
Killer B 02-07 WRX / 04-21 STI OEM Coupler for Motorsport Extreme Flow HARD Turbo Inlet | TIEJCOE
Regular price $49.00Sale price $49.00 Regular priceUnit price per$49.00 -
IAG 06-14 WRX / 04-21 STI Air / Oil Separator | AOS V2 Competition to V2 Street Series Conversion Kit | V2 AOS Only | IAG-ENG-7110
Regular price $104.99Sale price $104.99 Regular priceUnit price per$104.99 -
Up to $21.21 off
In StockTorque Solution Stock Location Turbo Oil Feed Line
Fits: 06-14 WRX, 04-21 STI
Only 11 leftRegular price $101.00Sale price $101.00 Regular priceUnit price per$122.21 -
Up to $12 off
In StockTomei 06-14 WRX / 04-21 STI / 05-09 LGT Head Gasket 1.2mm Pair
Only 5 leftRegular price $108.00Sale price $108.00 Regular priceUnit price per$120.00 -
Grimmspeed V2 Bypass Valve Red
Fits: 04-21 STI, 02-07 WRX
Regular price $311.00Sale price $311.00 Regular priceUnit price per$311.00 -
In StockCOBB Subaru EJ Turbo Blanket Black Lava
Only 9 leftRegular price $217.00Sale price $217.00 Regular priceUnit price per$217.00 -
IAG Performance Unequal Length Header & Up Pipe for 2002-2014 WRX and 2004-21 WRX STI | IAG-EXT-1000
Regular price $849.99Sale price $849.99 Regular priceUnit price per$849.99 -
IAG Performance Equal Length Header & Up Pipe for Multiple Subaru Fitments
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
Up to $28.50 off
In StockTurbosmart Blow Off Valve Kompact Dual Port Black
Fits: 02-07 WRX, 04-21 STI
Only 10 leftRegular price $256.49Sale price $256.49 Regular priceUnit price per$284.99 -
![Perrin [02-07 WRX, 04-07 STI] Post MAF Hose - Black - JDMuscleAir Intake and MAF HosesperPSP-INT-350BK](//jdmuscleusa.com/cdn/shop/products/perrin-02-07-wrx-04-07-sti-post-maf-hose-black-6669568.jpg?v=1781013192&width=220)
Up to $31.75 off
In StockPerrin Post MAF Hose - Black
Fits: 02-07 WRX, 04-07 STI
Only 7 leftRegular price $95.25Sale price $95.25 Regular priceUnit price per$127.00
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012.jpg?v=1625804898&width=220)
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012-2.jpg?v=1625804898&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI] TGV to Engine Gasket Pair | 032001](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-tumbler-to-engine-gaskets-for-subaru-gasket-032001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-032001.jpg?v=1614517838&width=220)
![Subaru OEM Tumbler to Engine Gasket [WRX/STI Subaru EJ Turbo Models] | 14035AA421](http://jdmuscleusa.com/cdn/shop/products/subaru-oem-tumbler-to-engine-gasket-wrx-sti-subaru-ej-turbo-models-2002-2020-14035aa421-intake-system-gaskets-subaru-oem-sub14035aa421.jpg?v=1614543684&width=220)
![Perrin [02-07 WRX, 04-07 STI] Post MAF Hose - Black - JDMuscleAir Intake and MAF HosesperPSP-INT-350BK](http://jdmuscleusa.com/cdn/shop/products/perrin-02-07-wrx-04-07-sti-post-maf-hose-black-6669568.jpg?v=1781013192&width=220)