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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![Torque Solution [06 - 21 STI, 08 - 14 WRX] Big Bore 76mm Throttle Body Adapter - Black | TS - SU - 870O - BK - JDMuscleIntake Misc.tqsTS-SU-870O-BK](//jdmuscleusa.com/cdn/shop/files/torque-solution-06-21-sti-08-14-wrx-big-bore-76mm-throttle-body-adapter-black-ts-su-870o-bk-7394120.webp?v=1770321806&width=220)
![Torque Solution [06 - 21 STI, 08 - 14 WRX] Big Bore 76mm Throttle Body Adapter - Black | TS - SU - 870O - BK - JDMuscleIntake Misc.tqsTS-SU-870O-BK](//jdmuscleusa.com/cdn/shop/files/torque-solution-06-21-sti-08-14-wrx-big-bore-76mm-throttle-body-adapter-black-ts-su-870o-bk-9840002.webp?v=1770321806&width=220)
Up to $13.88 off
In StockTorque Solution Big Bore 76mm Throttle Body Adapter-Black | TS-SU-870O-BK
Fits: 06-21 STI, 08-14 WRX
Only 1 leftRegular price $75.00Sale price $75.00 Regular priceUnit price per$88.88 -
![Torque Solution [06 - 14 WRX, 07 - 21 STI] Lightweight Alternator Pulley - Black | TS - SU - 878 - JDMusclePulleystqsTS-SU-878](//jdmuscleusa.com/cdn/shop/files/torque-solution-06-14-wrx-07-21-sti-lightweight-alternator-pulley-black-ts-su-878-3315618.webp?v=1770321802&width=220)
Up to $4.99 offTorque Solution Lightweight Alternator Pulley-Black | TS-SU-878
Fits: 06-14 WRX, 07-21 STI
Regular price $45.00Sale price $45.00 Regular priceUnit price per$49.99 -
![Torque Solution [02 - 05 WRX, 04 - 06 STI] Lightweight Alternator Pulley - Black | TS - SU - 877 - JDMusclePulleystqsTS-SU-877](//jdmuscleusa.com/cdn/shop/files/torque-solution-02-05-wrx-04-06-sti-lightweight-alternator-pulley-black-ts-su-877-8006391.webp?v=1770321802&width=220)
Up to $4.99 offTorque Solution Lightweight Alternator Pulley-Black | TS-SU-877
Fits: 02-05 WRX, 04-06 STI
Regular price $45.00Sale price $45.00 Regular priceUnit price per$49.99 -
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filters Pro 5R | 30 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe30-10010](//jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filters-pro-5r-30-10010-5945465.jpg?v=1770321854&width=220)
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filters Pro 5R | 30 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe30-10010](//jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filters-pro-5r-30-10010-1292642.jpg?v=1770321854&width=220)
In StockaFe MagnumFLOW Air Filters Pro 5R | 30-10010
Fits: 02-07 WRX, 04-07 STI
Only 5 leftRegular price $71.00Sale price $71.00 Regular priceUnit price per$71.00 -
![Torque Solution [02-07 WRX, 04-21 STI, 04-08 FXT] Turbo Inlet Hose - Black | TS-SU-463BK](//jdmuscleusa.com/cdn/shop/products/torque-solution-turbo-inlet-hose-black-02-07-subaru-wrx-04-19-sti-05-09-legacy-gt-04-13-ftx-turbo-inlet-hoses-and-pipes-torque-solution-tqsts-su-463bk.jpg?v=1614518827&width=220)
Up to $50.77 off
In StockTorque Solution Turbo Inlet Hose - Black | TS-SU-463BK
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 7 leftRegular price $227.00Sale price $227.00 Regular priceUnit price per$277.77 -
![Mishimoto [02-07 WRX, 04-07 STI] Red Silicone 80mm Airbox Hose | MMHOSE-WRX-AM8RD](//jdmuscleusa.com/cdn/shop/products/mishimoto-red-silicone-80mm-airbox-hose-subaru-wrx-2002-2007-intake-hoses-mishimoto-mmhose-wrx-am8rd.jpg?v=1614515247&width=220)
Up to $9.05 offMishimoto Red Silicone 80mm Airbox Hose | MMHOSE-WRX-AM8RD
Fits: 02-07 WRX, 04-07 STI
Regular price $93.95Sale price $93.95 Regular priceUnit price per$103.00 -
![Mishimoto [02-07 WRX, 04-07 STI] Blue Silicone 80mm Air Box Hose | MMHOSE-WRX-AM8BL](//jdmuscleusa.com/cdn/shop/products/mishimoto-blue-silicone-80mm-air-box-hose-subaru-wrx-2002-2007-air-intake-and-maf-hoses-mishimoto-mmhose-wrx-am8bl.jpg?v=1614515247&width=220)
Up to $9.05 offMishimoto Blue Silicone 80mm Air Box Hose | MMHOSE-WRX-AM8BL
Fits: 02-07 WRX, 04-07 STI
Regular price $93.95Sale price $93.95 Regular priceUnit price per$103.00 -
![Mishimoto [02-07 WRX, 04-07 STI] Red Silicone 76mm Air Box Hose | MMHOSE-WRX-AM7RD](//jdmuscleusa.com/cdn/shop/products/mishimoto-red-silicone-76mm-air-box-hose-subaru-wrx-2002-2007-air-intake-and-maf-hoses-mishimoto-mmhose-wrx-am7rd.jpg?v=1614515250&width=220)
Up to $9.05 offMishimoto Red Silicone 76mm Air Box Hose | MMHOSE-WRX-AM7RD
Fits: 02-07 WRX, 04-07 STI
Regular price $90.95Sale price $90.95 Regular priceUnit price per$100.00 -
![HPS [02 - 07 WRX, 04 - 07 STI] Performance Cold Air Intake w/ Heatshield - Red | 827 - 606R - JDMuscleIntakesHPS827-606R](//jdmuscleusa.com/cdn/shop/files/hps-02-07-wrx-04-07-sti-performance-cold-air-intake-w-heatshield-red-827-606r-2134333.jpg?v=1770321854&width=220)
Up to $8 offHPS Performance Cold Air Intake w/ Heatshield - Red | 827-606R
Fits: 02-07 WRX, 04-07 STI
Regular price $246.00Sale price $246.00 Regular priceUnit price per$254.00 -
![IAG Performance [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] BIG MAF Intake | IAG - AFD - 1100 - JDMuscleIntakesIAG-AFD-1100](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-07-wrx-04-07-sti-04-08-fxt-big-maf-intake-iag-afd-1100-3442712.jpg?v=1770321854&width=220)
![IAG Performance [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] BIG MAF Intake | IAG - AFD - 1100 - JDMuscleIntakesIAG-AFD-1100](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-07-wrx-04-07-sti-04-08-fxt-big-maf-intake-iag-afd-1100-2477693.jpg?v=1770321854&width=220)
IAG Performance BIG MAF Intake
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Regular price $274.99Sale price $274.99 Regular priceUnit price per$274.99 -
![HKS [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] Super Power Flow Intake System | 70019 - AF103 - JDMuscleIntakeshks70019-AF103](//jdmuscleusa.com/cdn/shop/files/hks-02-07-wrx-04-07-sti-04-08-fxt-super-power-flow-intake-system-70019-af103-2671610.jpg?v=1770321854&width=220)
![HKS [02-07 WRX, 04-07 STI, 04-08 FXT] Super Power Flow Intake System | 70019-AF103](//jdmuscleusa.com/cdn/shop/files/63d46fbdf305dcfb15494b8cc2f2d993.gif?v=1746808937&width=220)
HKS Super Power Flow Intake System | 70019-AF103
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Regular price $220.00Sale price $220.00 Regular priceUnit price per$220.00 -
![HPS Performance [02 - 07 WRX, 04 - 07 STI] Performance Short Ram Air Intake w/ Heat Shield - Black | 827 - 606WB - JDMuscleIntakesHPS827-606WB](//jdmuscleusa.com/cdn/shop/files/hps-performance-02-07-wrx-04-07-sti-performance-short-ram-air-intake-w-heat-shield-black-827-606wb-8559662.jpg?v=1770329176&width=220)
![HPS Performance [02 - 07 WRX, 04 - 07 STI] Performance Short Ram Air Intake w/ Heat Shield - Black | 827 - 606WB - JDMuscleIntakesHPS827-606WB](//jdmuscleusa.com/cdn/shop/files/hps-performance-02-07-wrx-04-07-sti-performance-short-ram-air-intake-w-heat-shield-black-827-606wb-3099378.jpg?v=1770329176&width=220)
Up to $8 offHPS Performance Performance Short Ram Air Intake w/ Heat Shield - Black | 827-606WB
Fits: 02-07 WRX, 04-07 STI
Regular price $246.00Sale price $246.00 Regular priceUnit price per$254.00 -
![HKS [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] Racing Suction Intake System | 70020 - AF101 - JDMuscleIntakesHKS70020-AF101](//jdmuscleusa.com/cdn/shop/files/hks-02-07-wrx-04-07-sti-04-08-fxt-racing-suction-intake-system-70020-af101-1747881.jpg?v=1770321854&width=220)
In StockHKS Racing Suction Intake System | 70020-AF101
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Only 3 leftRegular price $374.00Sale price $374.00 Regular priceUnit price per$374.00 -
![Apexi [02 - 07 WRX, 04 - 07 STI] Panel Filter | 503 - N101 - JDMuscleHigh Flow Replacement Panel FiltersAPE503-N101](//jdmuscleusa.com/cdn/shop/files/apexi-02-07-wrx-04-07-sti-panel-filter-503-n101-3801420.jpg?v=1770321854&width=220)
Apexi Panel Filter | 503-N101
Fits: 02-07 WRX, 04-07 STI
Regular price $71.00Sale price $71.00 Regular priceUnit price per$71.00 -
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filter | 31 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe31-10010](//jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filter-31-10010-9892314.jpg?v=1770321855&width=220)
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filter | 31 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe31-10010](//jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filter-31-10010-7263714.jpg?v=1770321855&width=220)
In StockaFe MagnumFLOW Air Filter | 31-10010
Fits: 02-07 WRX, 04-07 STI
Only 1 leftRegular price $76.00Sale price $76.00 Regular priceUnit price per$76.00 -
![Overtake Intake Manifold to TGV Gasket(pair) - Enlarged Bore [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] | - JDMuscleIntake System GasketsovtovtOVRA10036](//jdmuscleusa.com/cdn/shop/files/overtake-intake-manifold-to-tgv-gasketpair-enlarged-bore-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-2853393.jpg?v=1770321916&width=220)
![Overtake Intake Manifold to TGV Gasket(pair) - Enlarged Bore [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] | - JDMuscleIntake System GasketsovtovtOVRA10036](//jdmuscleusa.com/cdn/shop/files/overtake-intake-manifold-to-tgv-gasketpair-enlarged-bore-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-1991018.jpg?v=1770321917&width=220)
Overtake Intake Manifold to TGV Gasket(pair) - Enlarged Bore |
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $12.00Sale price $12.00 Regular priceUnit price per$12.00
![Torque Solution [06 - 21 STI, 08 - 14 WRX] Big Bore 76mm Throttle Body Adapter - Black | TS - SU - 870O - BK - JDMuscleIntake Misc.tqsTS-SU-870O-BK](http://jdmuscleusa.com/cdn/shop/files/torque-solution-06-21-sti-08-14-wrx-big-bore-76mm-throttle-body-adapter-black-ts-su-870o-bk-7394120.webp?v=1770321806&width=220)
![Torque Solution [06 - 21 STI, 08 - 14 WRX] Big Bore 76mm Throttle Body Adapter - Black | TS - SU - 870O - BK - JDMuscleIntake Misc.tqsTS-SU-870O-BK](http://jdmuscleusa.com/cdn/shop/files/torque-solution-06-21-sti-08-14-wrx-big-bore-76mm-throttle-body-adapter-black-ts-su-870o-bk-9840002.webp?v=1770321806&width=220)
![Torque Solution [06 - 14 WRX, 07 - 21 STI] Lightweight Alternator Pulley - Black | TS - SU - 878 - JDMusclePulleystqsTS-SU-878](http://jdmuscleusa.com/cdn/shop/files/torque-solution-06-14-wrx-07-21-sti-lightweight-alternator-pulley-black-ts-su-878-3315618.webp?v=1770321802&width=220)
![Torque Solution [02 - 05 WRX, 04 - 06 STI] Lightweight Alternator Pulley - Black | TS - SU - 877 - JDMusclePulleystqsTS-SU-877](http://jdmuscleusa.com/cdn/shop/files/torque-solution-02-05-wrx-04-06-sti-lightweight-alternator-pulley-black-ts-su-877-8006391.webp?v=1770321802&width=220)
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filters Pro 5R | 30 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe30-10010](http://jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filters-pro-5r-30-10010-5945465.jpg?v=1770321854&width=220)
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filters Pro 5R | 30 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe30-10010](http://jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filters-pro-5r-30-10010-1292642.jpg?v=1770321854&width=220)
![Torque Solution [02-07 WRX, 04-21 STI, 04-08 FXT] Turbo Inlet Hose - Black | TS-SU-463BK](http://jdmuscleusa.com/cdn/shop/products/torque-solution-turbo-inlet-hose-black-02-07-subaru-wrx-04-19-sti-05-09-legacy-gt-04-13-ftx-turbo-inlet-hoses-and-pipes-torque-solution-tqsts-su-463bk.jpg?v=1614518827&width=220)
![Mishimoto [02-07 WRX, 04-07 STI] Red Silicone 80mm Airbox Hose | MMHOSE-WRX-AM8RD](http://jdmuscleusa.com/cdn/shop/products/mishimoto-red-silicone-80mm-airbox-hose-subaru-wrx-2002-2007-intake-hoses-mishimoto-mmhose-wrx-am8rd.jpg?v=1614515247&width=220)
![Mishimoto [02-07 WRX, 04-07 STI] Blue Silicone 80mm Air Box Hose | MMHOSE-WRX-AM8BL](http://jdmuscleusa.com/cdn/shop/products/mishimoto-blue-silicone-80mm-air-box-hose-subaru-wrx-2002-2007-air-intake-and-maf-hoses-mishimoto-mmhose-wrx-am8bl.jpg?v=1614515247&width=220)
![Mishimoto [02-07 WRX, 04-07 STI] Red Silicone 76mm Air Box Hose | MMHOSE-WRX-AM7RD](http://jdmuscleusa.com/cdn/shop/products/mishimoto-red-silicone-76mm-air-box-hose-subaru-wrx-2002-2007-air-intake-and-maf-hoses-mishimoto-mmhose-wrx-am7rd.jpg?v=1614515250&width=220)
![HPS [02 - 07 WRX, 04 - 07 STI] Performance Cold Air Intake w/ Heatshield - Red | 827 - 606R - JDMuscleIntakesHPS827-606R](http://jdmuscleusa.com/cdn/shop/files/hps-02-07-wrx-04-07-sti-performance-cold-air-intake-w-heatshield-red-827-606r-2134333.jpg?v=1770321854&width=220)
![IAG Performance [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] BIG MAF Intake | IAG - AFD - 1100 - JDMuscleIntakesIAG-AFD-1100](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-07-wrx-04-07-sti-04-08-fxt-big-maf-intake-iag-afd-1100-3442712.jpg?v=1770321854&width=220)
![IAG Performance [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] BIG MAF Intake | IAG - AFD - 1100 - JDMuscleIntakesIAG-AFD-1100](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-07-wrx-04-07-sti-04-08-fxt-big-maf-intake-iag-afd-1100-2477693.jpg?v=1770321854&width=220)
![HKS [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] Super Power Flow Intake System | 70019 - AF103 - JDMuscleIntakeshks70019-AF103](http://jdmuscleusa.com/cdn/shop/files/hks-02-07-wrx-04-07-sti-04-08-fxt-super-power-flow-intake-system-70019-af103-2671610.jpg?v=1770321854&width=220)
![HKS [02-07 WRX, 04-07 STI, 04-08 FXT] Super Power Flow Intake System | 70019-AF103](http://jdmuscleusa.com/cdn/shop/files/63d46fbdf305dcfb15494b8cc2f2d993.gif?v=1746808937&width=220)
![HPS Performance [02 - 07 WRX, 04 - 07 STI] Performance Short Ram Air Intake w/ Heat Shield - Black | 827 - 606WB - JDMuscleIntakesHPS827-606WB](http://jdmuscleusa.com/cdn/shop/files/hps-performance-02-07-wrx-04-07-sti-performance-short-ram-air-intake-w-heat-shield-black-827-606wb-8559662.jpg?v=1770329176&width=220)
![HPS Performance [02 - 07 WRX, 04 - 07 STI] Performance Short Ram Air Intake w/ Heat Shield - Black | 827 - 606WB - JDMuscleIntakesHPS827-606WB](http://jdmuscleusa.com/cdn/shop/files/hps-performance-02-07-wrx-04-07-sti-performance-short-ram-air-intake-w-heat-shield-black-827-606wb-3099378.jpg?v=1770329176&width=220)
![HKS [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] Racing Suction Intake System | 70020 - AF101 - JDMuscleIntakesHKS70020-AF101](http://jdmuscleusa.com/cdn/shop/files/hks-02-07-wrx-04-07-sti-04-08-fxt-racing-suction-intake-system-70020-af101-1747881.jpg?v=1770321854&width=220)
![Apexi [02 - 07 WRX, 04 - 07 STI] Panel Filter | 503 - N101 - JDMuscleHigh Flow Replacement Panel FiltersAPE503-N101](http://jdmuscleusa.com/cdn/shop/files/apexi-02-07-wrx-04-07-sti-panel-filter-503-n101-3801420.jpg?v=1770321854&width=220)
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filter | 31 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe31-10010](http://jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filter-31-10010-9892314.jpg?v=1770321855&width=220)
![aFe [02 - 07 WRX, 04 - 07 STI] MagnumFLOW Air Filter | 31 - 10010 - JDMuscleHigh Flow Replacement Panel Filtersafe31-10010](http://jdmuscleusa.com/cdn/shop/files/afe-02-07-wrx-04-07-sti-magnumflow-air-filter-31-10010-7263714.jpg?v=1770321855&width=220)
![Overtake Intake Manifold to TGV Gasket(pair) - Enlarged Bore [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] | - JDMuscleIntake System GasketsovtovtOVRA10036](http://jdmuscleusa.com/cdn/shop/files/overtake-intake-manifold-to-tgv-gasketpair-enlarged-bore-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-2853393.jpg?v=1770321916&width=220)
![Overtake Intake Manifold to TGV Gasket(pair) - Enlarged Bore [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] | - JDMuscleIntake System GasketsovtovtOVRA10036](http://jdmuscleusa.com/cdn/shop/files/overtake-intake-manifold-to-tgv-gasketpair-enlarged-bore-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-1991018.jpg?v=1770321917&width=220)