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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![Tomei [06-14 WRX / 04-21 STI / 05-09 LGT] Head Gasket .7mm Pair | TOMTA4070-SB02A - JDMuscleHead GasketsTOMTA4070-SB02A](//jdmuscleusa.com/cdn/shop/products/tomei-06-14-wrx-04-21-sti-05-09-lgt-head-gasket-7mm-pair-tomta4070-sb02a-3090235.jpg?v=1781014153&width=220)
![Tomei [06-14 WRX / 04-21 STI / 05-09 LGT] Head Gasket .7mm Pair | TOMTA4070-SB02A - JDMuscleHead GasketsTOMTA4070-SB02A](//jdmuscleusa.com/cdn/shop/products/tomei-06-14-wrx-04-21-sti-05-09-lgt-head-gasket-7mm-pair-tomta4070-sb02a-3109086.jpg?v=1781014154&width=220)
Up to $12 off
In StockTomei Head Gasket .7mm Pair | TOMTA4070-SB02A
Fits: 06-14 WRX / 04-21 STI / 05-09 LGT
Only 5 leftRegular price $108.00Sale price $108.00 Regular priceUnit price per$120.00 -
Up to $158 off
In StockTomei 02-07 WRX / 04-21 STI ARMS MX7960 Turbo | TB401A-SB01B
Only 4 leftRegular price $1,422.00Sale price $1,422.00 Regular priceUnit price per$1,580.00 -
Process West 02-14 WRX / 04-21 STI Engine Pulley Garnish Black | PWED02B
Regular price $78.65Sale price $78.65 Regular priceUnit price per$78.65 -
![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](//jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-1669663.jpg?v=1770327869&width=220)
![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](//jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-2634892.jpg?v=1770327869&width=220)
Nameless Performance Bypass Valve
Fits: 02-07 WRX, 02-21 STI, 02-07 Forester XT
Regular price $460.00Sale price $460.00 Regular priceUnit price per$314.00 -
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](//jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-8532909.jpg?v=1770327911&width=220)
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](//jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-9811679.jpg?v=1770327911&width=220)
Up to $54.99 off
In StockTorque Solution 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS-SU-565-NR
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 1 leftRegular price $245.00Sale price $245.00 Regular priceUnit price per$299.99 -
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-7871498.jpg?v=1770327974&width=220)
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-8214944.jpg?v=1770327974&width=220)
IAG Performance Street Series Oil Pan Silver
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT
Regular price $529.99Sale price $529.99 Regular priceUnit price per$529.99 -
IAG Performance Blow Off Valve Adapter
Fits: 02-07 WRX, 04-21 STI
Regular price $49.99Sale price $49.99 Regular priceUnit price per$49.99 -
iBR FLX01 - Upgrade Kit | 3 Pin and 5 Pin Harnesses
Regular price $399.99Sale price $399.99 Regular priceUnit price per$399.99 -
Cobb WRX/STI/FXT 4 Bar MAP Sensor *Sensor Only*
Regular price $197.00Sale price $197.00 Regular priceUnit price per$197.00 -
IAG Timing Belt Kit with IAG Red Racing Belt, Timing Guide, Adjustable Idlers & Tensioner
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $699.99Sale price $699.99 Regular priceUnit price per$699.99 -
IAG STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Intake Manifolds | IAG-AFD-2027BK
Regular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
IAG STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Package Process West Intake Manifolds | IAG-AFD-2028BK
Regular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
IAG Subaru STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Package Process West Intake Manifolds | IAG-AFD-2028SL
Regular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
Up to $70 offPerrin Air Oil Separator Red w/ FMIC | PSP-ENG-607RD
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT
Regular price $502.00Sale price $502.00 Regular priceUnit price per$572.00 -
Up to $7.05 off
In StockMishimoto Oil Block Sandwich Adaptor - Universal | MMOP-TPS
Regular price $66.95Sale price $66.95 Regular priceUnit price per$74.00 -
In StockCobb 3in 2-Bolt Exhaust Gasket
Only 1 leftRegular price $25.00Sale price $25.00 Regular priceUnit price per$25.00
![Tomei [06-14 WRX / 04-21 STI / 05-09 LGT] Head Gasket .7mm Pair | TOMTA4070-SB02A - JDMuscleHead GasketsTOMTA4070-SB02A](http://jdmuscleusa.com/cdn/shop/products/tomei-06-14-wrx-04-21-sti-05-09-lgt-head-gasket-7mm-pair-tomta4070-sb02a-3090235.jpg?v=1781014153&width=220)
![Tomei [06-14 WRX / 04-21 STI / 05-09 LGT] Head Gasket .7mm Pair | TOMTA4070-SB02A - JDMuscleHead GasketsTOMTA4070-SB02A](http://jdmuscleusa.com/cdn/shop/products/tomei-06-14-wrx-04-21-sti-05-09-lgt-head-gasket-7mm-pair-tomta4070-sb02a-3109086.jpg?v=1781014154&width=220)
![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-1669663.jpg?v=1770327869&width=220)
![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-2634892.jpg?v=1770327869&width=220)
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](http://jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-8532909.jpg?v=1770327911&width=220)
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](http://jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-9811679.jpg?v=1770327911&width=220)
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-7871498.jpg?v=1770327974&width=220)
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-8214944.jpg?v=1770327974&width=220)
