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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![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](//jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-red-078006r-2.jpg?v=1614675538&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](//jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-3.jpg?v=1614658553&width=220)
In StockGrimmSpeed Air/Oil Separator | 078006
Fits: 02-07 WRX / 04-21 STI
Only 2 leftRegular price $426.00Sale price $426.00 Regular priceUnit price per$426.00 -
Up to $2.70 off
In StockCusco Oil Drain Plug M20x1.5 - Universal
Regular price $24.30Sale price $24.30 Regular priceUnit price per$27.00 -
![COBB AccessPORT V3 [06 - 07 WRX, 04 - 07 STI, 05 - 06 LGT, 04 - 06 FXT] - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-002](//jdmuscleusa.com/cdn/shop/products/cobb-accessport-v3-06-07-wrx-04-07-sti-05-06-lgt-04-06-fxt-4794536.jpg?v=1770336568&width=220)
![COBB AccessPORT V3 [06 - 07 WRX, 04 - 07 STI, 05 - 06 LGT, 04 - 06 FXT] - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-002](//jdmuscleusa.com/cdn/shop/products/cobb-accessport-v3-06-07-wrx-04-07-sti-05-06-lgt-04-06-fxt-4447611.jpg?v=1770336568&width=220)
In StockCobb Tuning V3 AccessPORT
Fits: 06-07 WRX, 04-07 STI, 05-06 Legacy GT, 04-06 Forester XT, 05-06 Outback XT
Regular price $735.00Sale price $735.00 Regular priceUnit price per$735.00 -
In StockGrimmspeed 04-21 STI / 02-07 WRX V2 Bypass Valve Black | 126032BLK
Only 1 leftRegular price $352.00Sale price $352.00 Regular priceUnit price per$352.00 -
In StockHKS 06-14 WRX / 04-21 STI Stainless Steel Equal Length Exhaust Manifold | 14019-AF002
Regular price $809.00Sale price $809.00 Regular priceUnit price per$809.00 -
![Gates [06-07 WRX, 04-19 STI, 05-09 LGT, 04-09 FXT] Timing Kit w/ Water Pump | TCKWP328](//jdmuscleusa.com/cdn/shop/products/gates-timing-kit-w-water-pump-wrx-2006-2007-sti-2004-2019-legacy-gt-2005-2009-forester-xt-2004-2009-tckwp328-timing-belt-components-gates-gattckwp328.jpg?v=1614528230&width=220)
In StockGates Timing Kit w/ Water Pump | TCKWP328
Fits: 06-07 WRX, 04-19 STI, 05-09 LGT, 04-09 FXT
Only 14 leftRegular price $421.00Sale price $421.00 Regular priceUnit price per$421.00 -
Up to $76.98 off
In StockTurboXS RFL Blow Off Valve
Fits: 02-07 WRX, 04-21 STI
Regular price $248.00Sale price $248.00 Regular priceUnit price per$324.98 -
In StockWalbro 450lph In-Tank Fuel Pump E85 Version F90000267 - Universal
Regular price From $128.99Sale price From $128.99 Regular priceUnit price per$0.00 -
Up to $4.05 off
In StockMishimoto Carbon Fiber Radiator Cap - Universal
Only 8 leftRegular price $40.95Sale price $40.95 Regular priceUnit price per$45.00 -
Grimmspeed Up Pipe 3-Bolt Inlet - Subaru 2002-2014 WRX / 2004-21 STI / 2005-2009 LGT / 2004-2013 FXT | 007064
Regular price $393.00Sale price $393.00 Regular priceUnit price per$393.00 -
Up to $45.40 off
In StockARP 02-14 WRX / 02-21 STI Custom Age 625+ Head Stud Kit | 260-4704
Only 16 leftRegular price $610.00Sale price $610.00 Regular priceUnit price per$655.40 -
Up to $13 off
In StockSeibon Carbon Fiber Hood/Trunk Prop - Universal
Regular price $117.00Sale price $117.00 Regular priceUnit price per$130.00 -
Up to $20 off
In StockRadium Engineering Fuel Rail Plumbing Kit - Parallel
Fits: 04-21 STI
Only 12 leftRegular price $379.95Sale price $379.95 Regular priceUnit price per$399.95 -
![GrimmSpeed [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] Intake Manifold to TGV Gasket Pair | 023001 - JDMuscleIntake System Gasketgrm023001](//jdmuscleusa.com/cdn/shop/files/grimmspeed-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-intake-manifold-to-tgv-gasket-pair-023001-4508665.jpg?v=1770327638&width=220)
In StockGrimmSpeed Intake Manifold to TGV Gasket Pair | 023001
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Only 1 leftRegular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
![GrimmSpeed [02-07 WRX / 04-21 STI] Intercooler Y-Pipe Gaskets | 020024](//jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-y-pipe-gasket-pair-subaru-wrx-2002-2007-sti-2004-2020-020024-gaskets-grimmspeed-grm020024.jpg?v=1614517939&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Intercooler Y-Pipe Gaskets | 020024](//jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-y-pipe-gasket-pair-subaru-wrx-2002-2007-sti-2004-2020-020024-gaskets-grimmspeed-grm020024-2.jpg?v=1614675534&width=220)
In StockGrimmSpeed Intercooler Y-Pipe Gaskets | 020024
Fits: 02-07 WRX / 04-21 STI
Only 1 leftRegular price $33.00Sale price $33.00 Regular priceUnit price per$33.00 -
Up to $4 off
In StockRadium Engineering DIY Fuel Pump Wiring Kit - Universal
Regular price $75.95Sale price $75.95 Regular priceUnit price per$79.95
![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-red-078006r-2.jpg?v=1614675538&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Air/Oil Separator | 078006](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-air-oil-separator-subaru-sti-2004-2020-078006-air-oil-separators-grimmspeed-3.jpg?v=1614658553&width=220)
![COBB AccessPORT V3 [06 - 07 WRX, 04 - 07 STI, 05 - 06 LGT, 04 - 06 FXT] - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-002](http://jdmuscleusa.com/cdn/shop/products/cobb-accessport-v3-06-07-wrx-04-07-sti-05-06-lgt-04-06-fxt-4794536.jpg?v=1770336568&width=220)
![COBB AccessPORT V3 [06 - 07 WRX, 04 - 07 STI, 05 - 06 LGT, 04 - 06 FXT] - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-002](http://jdmuscleusa.com/cdn/shop/products/cobb-accessport-v3-06-07-wrx-04-07-sti-05-06-lgt-04-06-fxt-4447611.jpg?v=1770336568&width=220)
![Gates [06-07 WRX, 04-19 STI, 05-09 LGT, 04-09 FXT] Timing Kit w/ Water Pump | TCKWP328](http://jdmuscleusa.com/cdn/shop/products/gates-timing-kit-w-water-pump-wrx-2006-2007-sti-2004-2019-legacy-gt-2005-2009-forester-xt-2004-2009-tckwp328-timing-belt-components-gates-gattckwp328.jpg?v=1614528230&width=220)
![GrimmSpeed [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] Intake Manifold to TGV Gasket Pair | 023001 - JDMuscleIntake System Gasketgrm023001](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-intake-manifold-to-tgv-gasket-pair-023001-4508665.jpg?v=1770327638&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Intercooler Y-Pipe Gaskets | 020024](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-y-pipe-gasket-pair-subaru-wrx-2002-2007-sti-2004-2020-020024-gaskets-grimmspeed-grm020024.jpg?v=1614517939&width=220)
![GrimmSpeed [02-07 WRX / 04-21 STI] Intercooler Y-Pipe Gaskets | 020024](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-y-pipe-gasket-pair-subaru-wrx-2002-2007-sti-2004-2020-020024-gaskets-grimmspeed-grm020024-2.jpg?v=1614675534&width=220)
