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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Subaru OEM Valve Cover Left Baja 2004-2006 / Forester 2004-2013 / Impreza 2004-2010 / Legacy 2005-2009 / Outback 2005-2009 / STI 2004-21 / WRX 2006-21 | 13264AA400
Regular price $127.66Sale price $127.66 Regular priceUnit price per$127.66 -
![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Red | 125010 - JDMuscleAir Intake and MAF Hosesgrm125010](//jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-red-125010-6042562.jpg?v=1781013670&width=220)
![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Red | 125010 - JDMuscleAir Intake and MAF Hosesgrm125010](//jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-red-125010-5704856.jpg?v=1781013670&width=220)
GrimmSpeed Post MAF Hose Kit - Red | 125010
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Regular price $121.00Sale price $121.00 Regular priceUnit price per$121.00 -
Grimmspeed Turbocharger Replacement Oil Line Kit EJ Models | 123000
Regular price $121.00Sale price $121.00 Regular priceUnit price per$121.00 -
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1437545.jpg?v=1781013744&width=220)
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1858386.jpg?v=1781013744&width=220)
Up to $266.50 off
In StockPerrin Oil Cooler Kit w/PERRIN Core
Fits: 15-21 WRX
Only 8 leftRegular price $799.50Sale price $799.50 Regular priceUnit price per$1,066.00 -
Up to $178 off
In StockTomei ARMS BX7760 Turbo Saab 9-2X 2005-2006 / Subaru Baja 2005-2006 / Forester 2004-2008 / Impreza WRX 2002-2007 / Impreza STI 2004-2007 / WRX STI 15-21 | TB403A-SB01A
Only 4 leftRegular price $1,602.00Sale price $1,602.00 Regular priceUnit price per$1,780.00 -
Injen SP Cold Air Intake Polished Subaru Impreza WRX STI 2004-2007 / Impreza WRX 2004-2007 | SP1202P
Regular price $442.54Sale price $442.54 Regular priceUnit price per$442.54 -
![Perrin [02-07 WRX, 04-07 STI, 04-08 FXT] Drop In Panel Filter | PSP-INT-100](//jdmuscleusa.com/cdn/shop/products/PSP-INT-100.jpg?v=1737769406&width=220)
![Perrin [02-07 WRX, 04-07 STI, 04-08 FXT] Drop In Panel Filter | PSP-INT-100](//jdmuscleusa.com/cdn/shop/products/PSP-INT-100_1.jpg?v=1737769406&width=220)
Up to $16.75 offPerrin Drop In Panel Filter | PSP-INT-100
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Regular price $50.25Sale price $50.25 Regular priceUnit price per$67.00 -
Subaru OEM Cam Seal Subaru 2.5L SOHC EJ251 Subaru All Models | 806732150
Regular price $10.10Sale price $10.10 Regular priceUnit price per$10.10 -
![Cobb [04 - 06 STI, 04 - 05 FXT, 05 - 07 LGT] Side Feed To Top Feed Fuel Rail Conversion Kit w/ Fittings - JDMuscleFuel Railscobb331260](//jdmuscleusa.com/cdn/shop/products/cobb-04-06-sti-04-05-fxt-05-07-lgt-side-feed-to-top-feed-fuel-rail-conversion-kit-w-fittings-1934293.jpg?v=1775587571&width=220)
![Cobb [04 - 06 STI, 04 - 05 FXT, 05 - 07 LGT] Side Feed To Top Feed Fuel Rail Conversion Kit w/ Fittings - JDMuscleFuel Railscobb331260](//jdmuscleusa.com/cdn/shop/products/cobb-04-06-sti-04-05-fxt-05-07-lgt-side-feed-to-top-feed-fuel-rail-conversion-kit-w-fittings-4439986.jpg?v=1775587571&width=220)
Cobb Side Feed To Top Feed Fuel Rail Conversion Kit w/ Fittings
Fits: 04-06 STI, 04-05 FXT, 05-07 LGT
Regular price $226.00Sale price $226.00 Regular priceUnit price per$226.00 -
Up to $22.90 offTurbosmart 02-07 WRX / 04-21 STI Recirculating Blow Off Valve Kompact Plumb Back Black | TS-0203-1215
Regular price $206.09Sale price $206.09 Regular priceUnit price per$228.99 -
Up to $45.50 off
In StockTurbosmart 02-07 WRX / 04-21 STI / 06-08 FXT Dual Port Blow Off Valve | TS-0205-1015
Only 6 leftRegular price $409.49Sale price $409.49 Regular priceUnit price per$454.99 -
Up to $43.70 offTurbosmart 02-07 WRX / 04-21 STI / 06-08 FXT Plumb Back Recirculating Blow Off Valve Blue | TS-0205-1215
Regular price $393.29Sale price $393.29 Regular priceUnit price per$436.99 -
![Cobb [04 - 07 WRX/STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobb712500-SL](//jdmuscleusa.com/cdn/shop/products/cobb-04-07-wrxsti-front-mount-intercooler-kit-silver-3822016.jpg?v=1770336135&width=220)
![Cobb [04 - 07 WRX/STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobb712500-SL](//jdmuscleusa.com/cdn/shop/products/cobb-04-07-wrxsti-front-mount-intercooler-kit-silver-7541799.jpg?v=1770336135&width=220)
Cobb Front Mount Intercooler Kit Silver
Fits: 04-07 WRX/STI
Regular price $2,120.00Sale price $2,120.00 Regular priceUnit price per$2,120.00 -
![Cobb [02 - 07 WRX, 04 - 07 STI] Turboback Exhaust w/ 3in GESi Catted Downpipe - JDMuscleTurbo Back Exhaustscobb512301](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-turboback-exhaust-w-3in-gesi-catted-downpipe-2916411.jpg?v=1770336203&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI] Turboback Exhaust w/ 3in GESi Catted Downpipe - JDMuscleTurbo Back Exhaustscobb512301](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-turboback-exhaust-w-3in-gesi-catted-downpipe-2614381.jpg?v=1770336204&width=220)
Cobb Turboback Exhaust w/ 3in GESi Catted Downpipe
Fits: 02-07 WRX, 04-07 STI
Regular price $1,750.00Sale price $1,750.00 Regular priceUnit price per$1,750.00 -
![Cobb [02 - 07 WRX, 04 - 07 STI] Titanium Cat - Back Exhaust System - JDMuscleCat Back Exhaust Systemcobb512140](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-titanium-cat-back-exhaust-system-1460383.jpg?v=1770336210&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI] Titanium Cat - Back Exhaust System - JDMuscleCat Back Exhaust Systemcobb512140](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-titanium-cat-back-exhaust-system-1797137.jpg?v=1770336210&width=220)
Up to $19 offCobb Titanium Cat-Back Exhaust System
Fits: 02-07 WRX, 04-07 STI
Regular price $1,511.00Sale price $1,511.00 Regular priceUnit price per$1,530.00 -
![COBB [02 - 07 WRX , 04 - 21 STI , 04 - 08 FXT] MAP Sensor Adapter - JDMuscleEngine Management SensorscobbA12600](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-map-sensor-adapter-3505062.jpg?v=1770336259&width=220)
![COBB [02 - 07 WRX , 04 - 21 STI , 04 - 08 FXT] MAP Sensor Adapter - JDMuscleEngine Management SensorscobbA12600](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-map-sensor-adapter-3122976.jpg?v=1770336260&width=220)
In StockCOBB MAP Sensor Adapter
Fits: 02-07 WRX , 04-21 STI , 04-08 FXT
Only 8 leftRegular price $68.00Sale price $68.00 Regular priceUnit price per$68.00
![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Red | 125010 - JDMuscleAir Intake and MAF Hosesgrm125010](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-red-125010-6042562.jpg?v=1781013670&width=220)
![GrimmSpeed [02-07 WRX, 04-07 STI, 04-08 FXT] Post MAF Hose Kit - Red | 125010 - JDMuscleAir Intake and MAF Hosesgrm125010](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-02-07-wrx-04-07-sti-04-08-fxt-post-maf-hose-kit-red-125010-5704856.jpg?v=1781013670&width=220)
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1437545.jpg?v=1781013744&width=220)
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1858386.jpg?v=1781013744&width=220)
![Perrin [02-07 WRX, 04-07 STI, 04-08 FXT] Drop In Panel Filter | PSP-INT-100](http://jdmuscleusa.com/cdn/shop/products/PSP-INT-100.jpg?v=1737769406&width=220)
![Perrin [02-07 WRX, 04-07 STI, 04-08 FXT] Drop In Panel Filter | PSP-INT-100](http://jdmuscleusa.com/cdn/shop/products/PSP-INT-100_1.jpg?v=1737769406&width=220)
![Cobb [04 - 06 STI, 04 - 05 FXT, 05 - 07 LGT] Side Feed To Top Feed Fuel Rail Conversion Kit w/ Fittings - JDMuscleFuel Railscobb331260](http://jdmuscleusa.com/cdn/shop/products/cobb-04-06-sti-04-05-fxt-05-07-lgt-side-feed-to-top-feed-fuel-rail-conversion-kit-w-fittings-1934293.jpg?v=1775587571&width=220)
![Cobb [04 - 06 STI, 04 - 05 FXT, 05 - 07 LGT] Side Feed To Top Feed Fuel Rail Conversion Kit w/ Fittings - JDMuscleFuel Railscobb331260](http://jdmuscleusa.com/cdn/shop/products/cobb-04-06-sti-04-05-fxt-05-07-lgt-side-feed-to-top-feed-fuel-rail-conversion-kit-w-fittings-4439986.jpg?v=1775587571&width=220)
![Cobb [04 - 07 WRX/STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobb712500-SL](http://jdmuscleusa.com/cdn/shop/products/cobb-04-07-wrxsti-front-mount-intercooler-kit-silver-3822016.jpg?v=1770336135&width=220)
![Cobb [04 - 07 WRX/STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobb712500-SL](http://jdmuscleusa.com/cdn/shop/products/cobb-04-07-wrxsti-front-mount-intercooler-kit-silver-7541799.jpg?v=1770336135&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI] Turboback Exhaust w/ 3in GESi Catted Downpipe - JDMuscleTurbo Back Exhaustscobb512301](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-turboback-exhaust-w-3in-gesi-catted-downpipe-2916411.jpg?v=1770336203&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI] Turboback Exhaust w/ 3in GESi Catted Downpipe - JDMuscleTurbo Back Exhaustscobb512301](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-turboback-exhaust-w-3in-gesi-catted-downpipe-2614381.jpg?v=1770336204&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI] Titanium Cat - Back Exhaust System - JDMuscleCat Back Exhaust Systemcobb512140](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-titanium-cat-back-exhaust-system-1460383.jpg?v=1770336210&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI] Titanium Cat - Back Exhaust System - JDMuscleCat Back Exhaust Systemcobb512140](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-titanium-cat-back-exhaust-system-1797137.jpg?v=1770336210&width=220)
![COBB [02 - 07 WRX , 04 - 21 STI , 04 - 08 FXT] MAP Sensor Adapter - JDMuscleEngine Management SensorscobbA12600](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-map-sensor-adapter-3505062.jpg?v=1770336259&width=220)
![COBB [02 - 07 WRX , 04 - 21 STI , 04 - 08 FXT] MAP Sensor Adapter - JDMuscleEngine Management SensorscobbA12600](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-map-sensor-adapter-3122976.jpg?v=1770336260&width=220)