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 OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](//jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046.jpg?v=1614517761&width=220)
![GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](//jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046-2.jpg?v=1614675435&width=220)
GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo | 077046
Fits: Subaru Models, incl. 15-21 WRX/STI
Regular price $90.00Sale price $90.00 Regular priceUnit price per$90.00 -
In StockGrimmSpeed Turbo to Downpipe Gasket - Subaru Turbo
Regular price $34.00Sale price $34.00 Regular priceUnit price per$34.00 -
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](//jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance.jpg?v=1737769547&width=220)
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](//jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance-hyper-teal-papsp-eng-150te-2.jpg?v=1737769547&width=220)
Up to $17.55 off
In StockPerrin Belt Cover Black - Black/Red/Neon Yellow
Fits: 02-14 WRX, 04-21 STI
Regular price From $89.25Sale price From $89.25 Regular priceUnit price per$105.00 -
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](//jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-wrinkle-red-finish-121033.jpg?v=1614560912&width=220)
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](//jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-2.jpg?v=1614560913&width=220)
In StockGrimmSpeed Lightweight Battery Tie Down
Fits: All Subaru Models
Regular price $60.00Sale price $60.00 Regular priceUnit price per$60.00 -
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT] Uppipe to Turbo Gasket | 024001](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-up-pipe-to-turbo-gasket-gasket-024001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-024001.jpg?v=1614517788&width=220)
In StockGrimmSpeed Uppipe to Turbo Gasket
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT
Regular price $31.00Sale price $31.00 Regular priceUnit price per$31.00 -
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](//jdmuscleusa.com/cdn/shop/products/perrin-24-in-turbo-inlet-subaru-subaru-wrx-2002-2014-sti-2004-2020-forester-xt-2004-2008-legacy-gt-2005-2009-psp-int-401bk-turbo-inlet-hoses-and-pipes-perrin-performance-black-papsp-int-401bk.jpg?v=1737769440&width=220)
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](//jdmuscleusa.com/cdn/shop/files/psp-int-401rd_01x800_332061ca-fb72-4351-a345-329612bc1d26.jpg?v=1746731177&width=220)
Up to $49.95 off
In StockPerrin 2.4" Turbo Inlet Hose - Black/Red/Blue
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Regular price $283.05Sale price $283.05 Regular priceUnit price per$333.00 -
![Turbo XS [WRX/STI] OEM Downpipe to 3in Cat - Back Adapter w/Standard Exhaust Gasket | ADA - OEMDP - 3CB - JDMuscleExhaust Gaskets and HardwaretxsADA-OEMDP-3CB](//jdmuscleusa.com/cdn/shop/products/turbo-xs-wrxsti-oem-downpipe-to-3in-cat-back-adapter-wstandard-exhaust-gasket-ada-oemdp-3cb-3432239.jpg?v=1770328593&width=220)
Up to $9 offTurbo XS OEM Downpipe to 3in Cat-Back Adapter w/Standard Exhaust Gasket
Fits: WRX/STI
Regular price $30.00Sale price $30.00 Regular priceUnit price per$39.00 -
Up to $12.30 off
In StockPerrin Stiffi Battery Tie Down Red Subaru Models
Regular price $69.70Sale price $69.70 Regular priceUnit price per$82.00 -
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](//jdmuscleusa.com/cdn/shop/products/tomei-unequal-length-exhaust-manifold-subaru-wrx-2002-2014-sti-2004-2020-exhaust-headers-and-manifolds-tomei-tb6010-sb02a.jpg?v=1614535670&width=220)
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](//jdmuscleusa.com/cdn/shop/files/tomei-unequal-length-exhaust-manifold-2002-2014-wrx-2004-2021-sti-2005-2009-lgt-2005-2008-fxt-tb6010-sb02a-724209_500x375_fdb4fc10-610a-4882-9d2d-4660ce65554e.jpg?v=1686347698&width=220)
Up to $89 off
In StockTomei Unequal Length Exhaust Manifold/ Header | TB6010-SB02A
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT
Only 4 leftRegular price $801.00Sale price $801.00 Regular priceUnit price per$890.00 -
Up to $3 off
In StockVibrant 2-Bolt High Temperature Exhaust Gasket - Universal
Regular price From $5.99Sale price From $5.99 Regular priceUnit price per$7.99 -
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](//jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance.jpg?v=1737769395&width=220)
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](//jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance-2.jpg?v=1737769395&width=220)
Up to $41.70 off
In StockPerrin Recirculating Blow off Valve Red
Fits: 02-07 WRX, 04-21 STI
Regular price $236.30Sale price $236.30 Regular priceUnit price per$278.00 -
![Perrin [22-25 WRX, 02-07 WRX, 04-07 STI] Filter Replacement Cone Filter 3.125in | X-PSP-INT-208](//jdmuscleusa.com/cdn/shop/products/perrin-2-piece-replacement-filter-for-perrin-intakes-3125-inch-id-universal-x-psp-int-208-air-intake-filter-replacements-perrin-performance-pax-psp-int-208.jpg?v=1737769445&width=220)
Up to $13.95 off
In StockPerrin Filter Replacement Cone Filter 3.125in
Fits: 22-25 WRX, 02-07 WRX, 04-07 STI
Regular price $79.05Sale price $79.05 Regular priceUnit price per$93.00 -
Up to $13.20 off
In StockPerrin Battery Tie Down Neon Yellow
Fits: Most Subaru Models
Regular price $74.80Sale price $74.80 Regular priceUnit price per$88.00 -
![Invidia [02-07 WRX/STI / 04-08 FXT] Divorced Catted Downpipe | HS05SW1DPC](//jdmuscleusa.com/cdn/shop/products/invidia-divorced-catted-downpipe-subaru-wrx-sti-2002-2007-forester-xt-2004-2008-hs05sw1dpc-front-pipes-and-downpipes-y-pipes-invidia-invhs05sw1dpc.jpg?v=1614516947&width=220)
Up to $487.20 off
In StockInvidia Divorced Catted Downpipe
Fits: 02-07 WRX/STI, 04-08 FXT
Only 6 leftRegular price $903.00Sale price $903.00 Regular priceUnit price per$1,390.20 -
Up to $34 off
In StockInvidia Stock Downpipe to 3in Exhaust Adapter - Universal
Regular price $64.00Sale price $64.00 Regular priceUnit price per$98.00 -
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023.jpg?v=1614517904&width=220)
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023-2.jpg?v=1614675514&width=220)
GrimmSpeed Blow Off Valve Flange Gasket
Fits: 02-07 WRX, 04-21 STI
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00
![GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046.jpg?v=1614517761&width=220)
![GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046-2.jpg?v=1614675435&width=220)
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](http://jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance.jpg?v=1737769547&width=220)
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](http://jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance-hyper-teal-papsp-eng-150te-2.jpg?v=1737769547&width=220)
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-wrinkle-red-finish-121033.jpg?v=1614560912&width=220)
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-2.jpg?v=1614560913&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT] Uppipe to Turbo Gasket | 024001](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-up-pipe-to-turbo-gasket-gasket-024001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-024001.jpg?v=1614517788&width=220)
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](http://jdmuscleusa.com/cdn/shop/products/perrin-24-in-turbo-inlet-subaru-subaru-wrx-2002-2014-sti-2004-2020-forester-xt-2004-2008-legacy-gt-2005-2009-psp-int-401bk-turbo-inlet-hoses-and-pipes-perrin-performance-black-papsp-int-401bk.jpg?v=1737769440&width=220)
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](http://jdmuscleusa.com/cdn/shop/files/psp-int-401rd_01x800_332061ca-fb72-4351-a345-329612bc1d26.jpg?v=1746731177&width=220)
![Turbo XS [WRX/STI] OEM Downpipe to 3in Cat - Back Adapter w/Standard Exhaust Gasket | ADA - OEMDP - 3CB - JDMuscleExhaust Gaskets and HardwaretxsADA-OEMDP-3CB](http://jdmuscleusa.com/cdn/shop/products/turbo-xs-wrxsti-oem-downpipe-to-3in-cat-back-adapter-wstandard-exhaust-gasket-ada-oemdp-3cb-3432239.jpg?v=1770328593&width=220)
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](http://jdmuscleusa.com/cdn/shop/products/tomei-unequal-length-exhaust-manifold-subaru-wrx-2002-2014-sti-2004-2020-exhaust-headers-and-manifolds-tomei-tb6010-sb02a.jpg?v=1614535670&width=220)
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](http://jdmuscleusa.com/cdn/shop/files/tomei-unequal-length-exhaust-manifold-2002-2014-wrx-2004-2021-sti-2005-2009-lgt-2005-2008-fxt-tb6010-sb02a-724209_500x375_fdb4fc10-610a-4882-9d2d-4660ce65554e.jpg?v=1686347698&width=220)
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](http://jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance.jpg?v=1737769395&width=220)
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](http://jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance-2.jpg?v=1737769395&width=220)
![Perrin [22-25 WRX, 02-07 WRX, 04-07 STI] Filter Replacement Cone Filter 3.125in | X-PSP-INT-208](http://jdmuscleusa.com/cdn/shop/products/perrin-2-piece-replacement-filter-for-perrin-intakes-3125-inch-id-universal-x-psp-int-208-air-intake-filter-replacements-perrin-performance-pax-psp-int-208.jpg?v=1737769445&width=220)
![Invidia [02-07 WRX/STI / 04-08 FXT] Divorced Catted Downpipe | HS05SW1DPC](http://jdmuscleusa.com/cdn/shop/products/invidia-divorced-catted-downpipe-subaru-wrx-sti-2002-2007-forester-xt-2004-2008-hs05sw1dpc-front-pipes-and-downpipes-y-pipes-invidia-invhs05sw1dpc.jpg?v=1614516947&width=220)
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023.jpg?v=1614517904&width=220)
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023-2.jpg?v=1614675514&width=220)