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 $18.90 offPerrin Performance Afta MAF Hose Red WRX 2002-2014 / Legacy GT 2005-2009 / Outback XT 2005-2009 / STI 2004-21 | PSP-INT-355RD
Regular price $107.10Sale price $107.10 Regular priceUnit price per$126.00 -
Up to $72 off
In StockTomei 02-14 WRX / 04-21 STI Forged Connecting Rods | TA203A-SB01A
Only 5 leftRegular price $648.00Sale price $648.00 Regular priceUnit price per$720.00 -
Up to $178 off
In StockTomei ARMS BX8265 Turbo Subaru Models | inc. 2002-2007 WRX / 2004+ STI | TB403A-SB01C
Only 4 leftRegular price $1,602.00Sale price $1,602.00 Regular priceUnit price per$1,780.00 -
IAG Performance Competition Series Oil Pan w/ Baffle for Various Subaru Models
Regular price From $629.99Sale price From $629.99 Regular priceUnit price per$629.99 -
IAG Performance Competition Series EJ Timing Belt Tensioner
Regular price $589.99Sale price $589.99 Regular priceUnit price per$589.99 -
![IAG [02 - 07 WRX, 04 - 07 STI] Coolant Expansion Tank - JDMuscleOverflow / Expansion TanksIAG-ENG-5301RDRed](//jdmuscleusa.com/cdn/shop/products/iag-02-07-wrx-04-07-sti-coolant-expansion-tank-7514511.jpg?v=1772964132&width=220)
![IAG [02 - 07 WRX, 04 - 07 STI] Coolant Expansion Tank - JDMuscleOverflow / Expansion TanksIAG-ENG-5301BKBlack](//jdmuscleusa.com/cdn/shop/products/iag-02-07-wrx-04-07-sti-coolant-expansion-tank-4297653.jpg?v=1772964133&width=220)
IAG Coolant Expansion Tank
Fits: 02-07 WRX, 04-07 STI
Regular price $239.99Sale price $239.99 Regular priceUnit price per$239.99 -
IAG ARP 1/2" Head Stud Set for Subaru Multiple Fitments
Regular price $549.99Sale price $549.99 Regular priceUnit price per$549.99 -
IAG Stage 2.5 Subaru EJ25 Closed Deck Short Block for Subaru Multiple Fitments
Regular price From $4,853.68Sale price From $4,853.68 Regular priceUnit price per$4,799.99 -
IAG Side to Top Feed Fuel Rail Conversion Kit
Fits: 04-06 STI, 05-07 LGT, 04-05 FXT
Regular price $219.99Sale price $219.99 Regular priceUnit price per$219.99 -
IAG Braided Fuel Line & Fitting Kit for Subaru Multiple Fitments
Regular price $299.99Sale price $299.99 Regular priceUnit price per$299.99 -
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](//jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2611020.jpg?v=1770331227&width=220)
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](//jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2980305.jpg?v=1770331227&width=220)
IAG Performance V3 Top Feed Fuel Rails Black
Fits: 02-14 WRX, 07-21 STI, 08-12 LGT, 06-13 FXT
Regular price $219.99Sale price $219.99 Regular priceUnit price per$219.99 -
IAG Braided Fuel Line & Fitting Kit - IAG Top Feed FR for Subaru Multiple Fitments
Regular price $319.99Sale price $319.99 Regular priceUnit price per$319.99 -
In StockTorque Solution HD Cam Bolt for Subaru EJ Single AVCS / Dual AVCS | TS-SU-626-1
Only 2 leftRegular price $19.00Sale price $19.00 Regular priceUnit price per$19.00 -
![COBB [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Lightweight Crank Pulley Black - JDMusclePulleyscobb300102BK](//jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-04-21-sti-05-09-lgt-lightweight-crank-pulley-black-5680990.jpg?v=1770336372&width=220)
![COBB [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Lightweight Crank Pulley Black - JDMusclePulleyscobb300102BK](//jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-04-21-sti-05-09-lgt-lightweight-crank-pulley-black-1789589.jpg?v=1770336372&width=220)
COBB Lightweight Crank Pulley Black
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT
Regular price $169.00Sale price $169.00 Regular priceUnit price per$169.00 -
Subaru Oil Cap Gasket Ascent 2019-2022 / Baja 2002-2006 / BRZ 2013-2022 / Crosstrek 2013-2022 / Forester 1998-2022 / Impreza 1993-2022 / Justy 1988-1994 / Legacy 1990-2002 / Outback 2005-2022 / STI 2004-21 / WRX 2002-2022 | 803942020
Regular price $10.66Sale price $10.66 Regular priceUnit price per$10.66 -
Subaru OEM Valve Cover Left Baja 2004-2006 / Forester 2004-2013 / Impreza 2004-2010 / Legacy 2005-2012 / Outback 2005-2009 / STI 2004-21 / WRX 2006-21 | 13278AA320
Regular price $127.66Sale price $127.66 Regular priceUnit price per$127.66
![IAG [02 - 07 WRX, 04 - 07 STI] Coolant Expansion Tank - JDMuscleOverflow / Expansion TanksIAG-ENG-5301RDRed](http://jdmuscleusa.com/cdn/shop/products/iag-02-07-wrx-04-07-sti-coolant-expansion-tank-7514511.jpg?v=1772964132&width=220)
![IAG [02 - 07 WRX, 04 - 07 STI] Coolant Expansion Tank - JDMuscleOverflow / Expansion TanksIAG-ENG-5301BKBlack](http://jdmuscleusa.com/cdn/shop/products/iag-02-07-wrx-04-07-sti-coolant-expansion-tank-4297653.jpg?v=1772964133&width=220)
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](http://jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2611020.jpg?v=1770331227&width=220)
![IAG Performance [02 - 14 WRX / 07 - 21 STI / 08 - 12 LGT / 06 - 13 FXT] V3 Top Feed Fuel Rails Black | IAG - AFD - 2102 - JDMuscleFuel RailsIAG-AFD-2102BKBlack Finish](http://jdmuscleusa.com/cdn/shop/products/iag-performance-02-14-wrx-07-21-sti-08-12-lgt-06-13-fxt-v3-top-feed-fuel-rails-black-iag-afd-2102-2980305.jpg?v=1770331227&width=220)
![COBB [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Lightweight Crank Pulley Black - JDMusclePulleyscobb300102BK](http://jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-04-21-sti-05-09-lgt-lightweight-crank-pulley-black-5680990.jpg?v=1770336372&width=220)
![COBB [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Lightweight Crank Pulley Black - JDMusclePulleyscobb300102BK](http://jdmuscleusa.com/cdn/shop/products/cobb-02-14-wrx-04-21-sti-05-09-lgt-lightweight-crank-pulley-black-1789589.jpg?v=1770336372&width=220)
