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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![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Red | PSP - ENG - 501RD - JDMuscleRadiator ShroudsperPSP-ENG-501RD](//jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-red-psp-eng-501rd-2801719.jpg?v=1770329479&width=220)
![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Red | PSP - ENG - 501RD - JDMuscleRadiator ShroudsperPSP-ENG-501RD](//jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-red-psp-eng-501rd-6086578.jpg?v=1770329479&width=220)
Up to $10.50 offPerrin Radiator Shroud - Red | PSP-ENG-501RD
Fits: 04-07 STI, 02-07 WRX
Regular price $59.50Sale price $59.50 Regular priceUnit price per$70.00 -
Killer B Motorsport Cast Aluminum High Flow Water Pump Housing EJ Series Powder Coat Black WRX 2004-2014 / STI 2004-2020 / Forester XT 2004-2013 / Outback XT 2004-2009 / Legacy GT 2004-2009 | WPHV2-B
Regular price $246.00Sale price $246.00 Regular priceUnit price per$246.00 -
![GrimmSpeed [Subaru Models inc. 02 - 14 WRX / 04 - 21 STI] Lightweight Crank Pulley Red | GRM095015R - JDMusclePulleysgrm095015R](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-models-inc-02-14-wrx-04-21-sti-lightweight-crank-pulley-red-grm095015r-6951138.jpg?v=1770329532&width=220)
![GrimmSpeed [Subaru Models inc. 02 - 14 WRX / 04 - 21 STI] Lightweight Crank Pulley Red | GRM095015R - JDMusclePulleysgrm095015R](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-models-inc-02-14-wrx-04-21-sti-lightweight-crank-pulley-red-grm095015r-2827011.jpg?v=1770329532&width=220)
GrimmSpeed Lightweight Crank Pulley Red | GRM095015R
Fits: Subaru Models inc. 02-14 WRX / 04-21 STI
Regular price $189.00Sale price $189.00 Regular priceUnit price per$189.00 -
Up to $70.57 off
In StockGSC Power-Division Single Beehive Valve Spring Set w/ Titanium Retainers Subaru Models | inc. 2002-2014 WRX / 2004+ STI | 5043
Regular price $399.92Sale price $399.92 Regular priceUnit price per$470.49 -
![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Hyper Pink | PSP - ENG - 501HP - JDMuscleRadiator ShroudsperPSP-ENG-501HP](//jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-hyper-pink-psp-eng-501hp-2153543.jpg?v=1770330251&width=220)
![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Hyper Pink | PSP - ENG - 501HP - JDMuscleRadiator ShroudsperPSP-ENG-501HP](//jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-hyper-pink-psp-eng-501hp-5033973.jpg?v=1770330252&width=220)
Up to $11.85 offPerrin Radiator Shroud - Hyper Pink | PSP-ENG-501HP
Fits: 04-07 STI, 02-07 WRX
Regular price $67.15Sale price $67.15 Regular priceUnit price per$79.00 -
Killer B Motorsport Dual Reservoir Tank | Wash / Coolant for 08-14 WRX/STi | DWR2
Regular price $494.00Sale price $494.00 Regular priceUnit price per$329.00 -
COBB Subaru Impreza WRX or STI Cat-Back Exhaust Replacement Hardware Kit Gasket and bolts
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
IAG Performance / ARP 14mm Head Stud Set Most Subaru Models
Regular price $599.99Sale price $599.99 Regular priceUnit price per$599.99 -
IAG Performance V2 Oil Pickup
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT
Regular price $149.99Sale price $149.99 Regular priceUnit price per$149.99 -
IAG V2 Alternator Relocation Kit for Reversed Intake Manifold for Multiple Subaru Fitments | IAG-ENG-5211
Regular price $249.99Sale price $249.99 Regular priceUnit price per$249.99 -
![IAG [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] V2 Timing Belt Guide | IAG - ENG - 5101BK - JDMuscleTiming Belt ComponentsIAG-ENG-5101BK](//jdmuscleusa.com/cdn/shop/products/iag-02-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-v2-timing-belt-guide-iag-eng-5101bk-9536642.jpg?v=1770331224&width=220)
![IAG [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] V2 Timing Belt Guide | IAG - ENG - 5101BK - JDMuscleTiming Belt ComponentsIAG-ENG-5101BK](//jdmuscleusa.com/cdn/shop/products/iag-02-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-v2-timing-belt-guide-iag-eng-5101bk-6320311.jpg?v=1770331224&width=220)
IAG V2 Timing Belt Guide
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-08 FXT
Regular price $59.99Sale price $59.99 Regular priceUnit price per$59.99 -
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](//jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-3840658.jpg?v=1770333079&width=220)
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](//jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-7574860.jpg?v=1770333079&width=220)
Cobb Tuning 4 Bar MAP Sensor Upgrade Kit
Fits: 04-20 STI, 02-07 WRX, 04-08 FXT
Regular price $236.00Sale price $236.00 Regular priceUnit price per$236.00 -
In StockCOBB Delrin Oil Cap Most Subaru Models
Only 9 leftRegular price $97.00Sale price $97.00 Regular priceUnit price per$97.00 -
Up to $19 off
In StockPerrin Panel Filter | PSP-INT-114
Fits: 19-21 WRX STI
Only 9 leftRegular price $57.00Sale price $57.00 Regular priceUnit price per$76.00 -
Up to $39.50 offPerrin Crank Pulley W/o AC Only Blue For Ej Engines WRX 2002-2014/ Outback 1995-2009/ Outback XT 2005-2009 / Forester 2003-2010/ Forester XT 2003-2013 /Legacy 1994-2009 / STI 2004-21/ Impreza 1993-2011 | PSP-ENG-102BL
Regular price $118.50Sale price $118.50 Regular priceUnit price per$158.00 -
Killer B Performance Hardened Uppipe Studs WRX/STI | All Turbo Models | STS
Regular price $32.00Sale price $32.00 Regular priceUnit price per$32.00
![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Red | PSP - ENG - 501RD - JDMuscleRadiator ShroudsperPSP-ENG-501RD](http://jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-red-psp-eng-501rd-2801719.jpg?v=1770329479&width=220)
![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Red | PSP - ENG - 501RD - JDMuscleRadiator ShroudsperPSP-ENG-501RD](http://jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-red-psp-eng-501rd-6086578.jpg?v=1770329479&width=220)
![GrimmSpeed [Subaru Models inc. 02 - 14 WRX / 04 - 21 STI] Lightweight Crank Pulley Red | GRM095015R - JDMusclePulleysgrm095015R](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-models-inc-02-14-wrx-04-21-sti-lightweight-crank-pulley-red-grm095015r-6951138.jpg?v=1770329532&width=220)
![GrimmSpeed [Subaru Models inc. 02 - 14 WRX / 04 - 21 STI] Lightweight Crank Pulley Red | GRM095015R - JDMusclePulleysgrm095015R](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-models-inc-02-14-wrx-04-21-sti-lightweight-crank-pulley-red-grm095015r-2827011.jpg?v=1770329532&width=220)
![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Hyper Pink | PSP - ENG - 501HP - JDMuscleRadiator ShroudsperPSP-ENG-501HP](http://jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-hyper-pink-psp-eng-501hp-2153543.jpg?v=1770330251&width=220)
![Perrin [04 - 07 STI, 02 - 07 WRX] Radiator Shroud - Hyper Pink | PSP - ENG - 501HP - JDMuscleRadiator ShroudsperPSP-ENG-501HP](http://jdmuscleusa.com/cdn/shop/products/perrin-04-07-sti-02-07-wrx-radiator-shroud-hyper-pink-psp-eng-501hp-5033973.jpg?v=1770330252&width=220)
![IAG [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] V2 Timing Belt Guide | IAG - ENG - 5101BK - JDMuscleTiming Belt ComponentsIAG-ENG-5101BK](http://jdmuscleusa.com/cdn/shop/products/iag-02-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-v2-timing-belt-guide-iag-eng-5101bk-9536642.jpg?v=1770331224&width=220)
![IAG [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] V2 Timing Belt Guide | IAG - ENG - 5101BK - JDMuscleTiming Belt ComponentsIAG-ENG-5101BK](http://jdmuscleusa.com/cdn/shop/products/iag-02-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-v2-timing-belt-guide-iag-eng-5101bk-6320311.jpg?v=1770331224&width=220)
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](http://jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-3840658.jpg?v=1770333079&width=220)
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](http://jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-7574860.jpg?v=1770333079&width=220)
