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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IAG Performance 02-14 WRX / 04-21 STI / 05-09 LGT / 04-13 FXT Oil Control Baffle / Windage Tray Combo | IAG-ENG-2087
Regular price From $199.99Sale price From $199.99 Regular priceUnit price per$199.99 -
Up to $20 offIAG Garret GT Series Turbo Oil Feed Line & AVCS Line for Subaru Multiple Fitments
Regular price From $119.99Sale price From $119.99 Regular priceUnit price per$136.36 -
![IAG [06 - 07 WRX, 04 - 07 STI] V3 Street Series Air/Oil Separator | IAG - ENG - 7180 - JDMuscleAir Oil SeparatorsIAG-ENG-7180RDRed](//jdmuscleusa.com/cdn/shop/products/iag-06-07-wrx-04-07-sti-v3-street-series-airoil-separator-iag-eng-7180-1469987.jpg?v=1770331223&width=220)
![IAG [06 - 07 WRX, 04 - 07 STI] V3 Street Series Air/Oil Separator | IAG - ENG - 7180 - JDMuscleAir Oil SeparatorsIAG-ENG-7180BKBlack](//jdmuscleusa.com/cdn/shop/products/iag-06-07-wrx-04-07-sti-v3-street-series-airoil-separator-iag-eng-7180-2710035.jpg?v=1770331224&width=220)
IAG V3 Street Series Air/Oil Separator
Fits: 06-07 WRX, 04-07 STI
Regular price $499.99Sale price $499.99 Regular priceUnit price per$439.99 -
In StockCOBB Oil Filler Cap Black Most Subaru Models
Only 7 leftRegular price $95.00Sale price $95.00 Regular priceUnit price per$95.00 -
Grimmspeed 02-07 WRX / 04-21 STI OVERTAKE BB500 Turbocharger Kit | 123006
Regular price $2,649.00Sale price $2,649.00 Regular priceUnit price per$2,649.00 -
In StockCobb Turbo Blanket Subaru EJ Stock
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Only 17 leftRegular price $198.00Sale price $198.00 Regular priceUnit price per$198.00 -
![COBB [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] Turbo Heat Shield | 512510 - JDMuscleExhaust Heat Shieldscobb512510](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-turbo-heat-shield-512510-9973074.jpg?v=1770336438&width=220)
![COBB [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] Turbo Heat Shield | 512510 - JDMuscleExhaust Heat Shieldscobb512510](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-turbo-heat-shield-512510-8795408.jpg?v=1770336438&width=220)
In StockCOBB Turbo Heat Shield
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 19 leftRegular price $101.00Sale price $101.00 Regular priceUnit price per$101.00 -
![Cobb Tuning [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] SF Short Ram Intake | 712100 - JDMuscleIntakescobb712100](//jdmuscleusa.com/cdn/shop/products/cobb-tuning-02-07-wrx-04-07-sti-04-08-fxt-sf-short-ram-intake-712100-3226437.jpg?v=1770336437&width=220)
In StockCobb Tuning SF Short Ram Intake
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Regular price $290.00Sale price $290.00 Regular priceUnit price per$290.00 -
Torque Solution TMIC Stud Kit WRX 2002-2007 / STI 2004-21 | TS-SU-TSK
Regular price $18.00Sale price $18.00 Regular priceUnit price per$18.00 -
![Moroso [02-07 WRX, 04-19 STI, 04-08 FXT] Aluminum Coolant Expansion Tank - JDMuscleOverflow / Expansion Tanksmor63784](//jdmuscleusa.com/cdn/shop/products/moroso-02-07-wrx-04-19-sti-04-08-fxt-aluminum-coolant-expansion-tank-8680274.jpg?v=1781013312&width=220)
In StockMoroso Aluminum Coolant Expansion Tank
Fits: 02-07 WRX, 04-19 STI, 04-08 FXT
Only 7 leftRegular price $220.99Sale price $220.99 Regular priceUnit price per$220.99 -
![Moroso [06-07 WRX, 04-07 STI] Fuse Box Cover Fabricated Aluminum | 74231 - JDMuscleFuse Box Coversmor74231](//jdmuscleusa.com/cdn/shop/products/moroso-06-07-wrx-04-07-sti-fuse-box-cover-fabricated-aluminum-74231-1585392.jpg?v=1781013313&width=220)
![Moroso [06-07 WRX, 04-07 STI] Fuse Box Cover Fabricated Aluminum | 74231 - JDMuscleFuse Box Coversmor74231](//jdmuscleusa.com/cdn/shop/files/moroso-06-07-wrx-04-07-sti-fuse-box-cover-fabricated-aluminum-74231-1627055.jpg?v=1781013313&width=220)
Moroso Fuse Box Cover Fabricated Aluminum | 74231
Fits: 06-07 WRX, 04-07 STI
Regular price $65.99Sale price $65.99 Regular priceUnit price per$65.99 -
![Killer B Motorsport [02-14 WRX, 04-21 STI] High Performance Oil Pan w/ High Flow Style Pick and Baffle Combo | PPBC-HF](//jdmuscleusa.com/cdn/shop/products/12a3ac2145dcb192ad3788234724b411.jpg?v=1626227195&width=220)
![Killer B Motorsport [02-14 WRX, 04-21 STI] High Performance Oil Pan w/ High Flow Style Pick and Baffle Combo | PPBC-HF](//jdmuscleusa.com/cdn/shop/products/06ede141c0e20d28fb7fc4ca8def9fc5.jpg?v=1626227195&width=220)
Killer B Motorsport High Performance Oil Pan w/ High Flow Style Pick and Baffle Combo | PPBC-HF
Fits: 02-14 WRX, 04-21 STI
Regular price $725.00Sale price $725.00 Regular priceUnit price per$725.00 -
In StockInjector Dynamics 02-14 WRX / 07-21 STI ID1050X Top Feed Fuel Injectors | 1050.48.11.WRX.4
Regular price $600.60Sale price $600.60 Regular priceUnit price per$600.60 -
Injector Dynamics 02-14 WRX / 07-21 STI Fuel Injectors Top Feed 1700cc | 1700.48.11.WRX.4
Regular price $1,218.00Sale price $1,218.00 Regular priceUnit price per$1,218.00 -
In StockInjector Dynamics Side / Top Feed Conversion Line Kit Subaru STI 2004-2006 / Legacy GT 2005-2006 | SFC FLK
Only 6 leftRegular price $275.00Sale price $275.00 Regular priceUnit price per$275.00 -
![Cobb [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] SF Airbox | 712160 - JDMuscleAir Boxescobb712160](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-04-08-fxt-sf-airbox-712160-9004082.jpg?v=1770336382&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] SF Airbox | 712160 - JDMuscleAir Boxescobb712160](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-04-08-fxt-sf-airbox-712160-6380881.jpg?v=1770336382&width=220)
In StockCobb SF Airbox
Fits: 02-07 WRX, 04-07 STI, 04-08 FXT
Only 3 leftRegular price $207.00Sale price $207.00 Regular priceUnit price per$207.00
![IAG [06 - 07 WRX, 04 - 07 STI] V3 Street Series Air/Oil Separator | IAG - ENG - 7180 - JDMuscleAir Oil SeparatorsIAG-ENG-7180RDRed](http://jdmuscleusa.com/cdn/shop/products/iag-06-07-wrx-04-07-sti-v3-street-series-airoil-separator-iag-eng-7180-1469987.jpg?v=1770331223&width=220)
![IAG [06 - 07 WRX, 04 - 07 STI] V3 Street Series Air/Oil Separator | IAG - ENG - 7180 - JDMuscleAir Oil SeparatorsIAG-ENG-7180BKBlack](http://jdmuscleusa.com/cdn/shop/products/iag-06-07-wrx-04-07-sti-v3-street-series-airoil-separator-iag-eng-7180-2710035.jpg?v=1770331224&width=220)
![COBB [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] Turbo Heat Shield | 512510 - JDMuscleExhaust Heat Shieldscobb512510](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-turbo-heat-shield-512510-9973074.jpg?v=1770336438&width=220)
![COBB [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] Turbo Heat Shield | 512510 - JDMuscleExhaust Heat Shieldscobb512510](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-turbo-heat-shield-512510-8795408.jpg?v=1770336438&width=220)
![Cobb Tuning [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] SF Short Ram Intake | 712100 - JDMuscleIntakescobb712100](http://jdmuscleusa.com/cdn/shop/products/cobb-tuning-02-07-wrx-04-07-sti-04-08-fxt-sf-short-ram-intake-712100-3226437.jpg?v=1770336437&width=220)
![Moroso [02-07 WRX, 04-19 STI, 04-08 FXT] Aluminum Coolant Expansion Tank - JDMuscleOverflow / Expansion Tanksmor63784](http://jdmuscleusa.com/cdn/shop/products/moroso-02-07-wrx-04-19-sti-04-08-fxt-aluminum-coolant-expansion-tank-8680274.jpg?v=1781013312&width=220)
![Moroso [06-07 WRX, 04-07 STI] Fuse Box Cover Fabricated Aluminum | 74231 - JDMuscleFuse Box Coversmor74231](http://jdmuscleusa.com/cdn/shop/products/moroso-06-07-wrx-04-07-sti-fuse-box-cover-fabricated-aluminum-74231-1585392.jpg?v=1781013313&width=220)
![Moroso [06-07 WRX, 04-07 STI] Fuse Box Cover Fabricated Aluminum | 74231 - JDMuscleFuse Box Coversmor74231](http://jdmuscleusa.com/cdn/shop/files/moroso-06-07-wrx-04-07-sti-fuse-box-cover-fabricated-aluminum-74231-1627055.jpg?v=1781013313&width=220)
![Killer B Motorsport [02-14 WRX, 04-21 STI] High Performance Oil Pan w/ High Flow Style Pick and Baffle Combo | PPBC-HF](http://jdmuscleusa.com/cdn/shop/products/12a3ac2145dcb192ad3788234724b411.jpg?v=1626227195&width=220)
![Killer B Motorsport [02-14 WRX, 04-21 STI] High Performance Oil Pan w/ High Flow Style Pick and Baffle Combo | PPBC-HF](http://jdmuscleusa.com/cdn/shop/products/06ede141c0e20d28fb7fc4ca8def9fc5.jpg?v=1626227195&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] SF Airbox | 712160 - JDMuscleAir Boxescobb712160](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-04-08-fxt-sf-airbox-712160-9004082.jpg?v=1770336382&width=220)
![Cobb [02 - 07 WRX, 04 - 07 STI, 04 - 08 FXT] SF Airbox | 712160 - JDMuscleAir Boxescobb712160](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-07-sti-04-08-fxt-sf-airbox-712160-6380881.jpg?v=1770336382&width=220)