Optimize your Subaru STI 2015-2021 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.
2015-2021 Subaru WRX STI Engine Parts
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![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 -
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-8998082.jpg?v=1770336383&width=220)
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-5259871.jpg?v=1770336383&width=220)
In StockCobb Redline Carbon Fiber Alternator Cover Gloss Finish
Fits: 08-14 WRX, 08-21 STI
Only 15 leftRegular price $183.00Sale price $183.00 Regular priceUnit price per$183.00 -
Up to $156 off
In StockPLM Power Driven Subaru EWG Up Pipe with Dump Tube 44mm
Only 8 leftRegular price $339.00Sale price $339.00 Regular priceUnit price per$495.00 -
![AWE [11-21 WRX/STI Sedan] Track Cat Back Exhaust Diamond Black Quad Tips 102mm | 3020-43066](//jdmuscleusa.com/cdn/shop/products/3020-43066.png?v=1635799857&width=220)
![AWE [11-21 WRX/STI Sedan] Track Cat Back Exhaust Diamond Black Quad Tips 102mm | 3020-43066](//jdmuscleusa.com/cdn/shop/products/awe-track-cat-back-exhaust-subaru-wrx-sti-sedan-2011-2019-diamond-black-quad-tips-102mm-3020-43066-cat-back-exhaust-system-awe-tuning-awe3020-43066-2.jpg?v=1633201817&width=220)
Up to $62.89 offAWE Track Cat Back Exhaust Diamond Black Quad Tips 102mm | 3020-43066
Fits: 11-21 WRX/STI Sedan
Regular price $1,195.00Sale price $1,195.00 Regular priceUnit price per$1,257.89 -
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](//jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048.jpg?v=1614517712&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](//jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048-2.jpg?v=1614675409&width=220)
In StockGrimmspeed Fender Shroud - Red | 096048
Fits: 15-21 WRX/STI
Only 8 leftRegular price $124.00Sale price $124.00 Regular priceUnit price per$124.00 -
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](//jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-black-grm090109.jpg?v=1614517802&width=220)
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](//jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-3.jpg?v=1614658473&width=220)
Grimmspeed Top Mount Intercooler Silicone Coupler Kit Black
Fits: 02-14 WRX / 04-21 STI
Regular price $135.00Sale price $135.00 Regular priceUnit price per$135.00 -
![Perrin [02-25 WRX, 04-21 STI] Crank Pulley | PSP-ENG-101](//jdmuscleusa.com/cdn/shop/products/perrin-crank-pulley-wrx-2015-2018-scion-fr-s-2013-2016-subaru-brz-2013-2018-impreza-2012-2013-crosstrek-psp-eng-101bk-psp-eng-101rd-pulleys-perrin-performance.jpg?v=1737769429&width=220)
![Perrin [02-25 WRX, 04-21 STI] Crank Pulley | PSP-ENG-101](//jdmuscleusa.com/cdn/shop/products/perrin-crank-pulley-wrx-2015-2018-scion-fr-s-2013-2016-subaru-brz-2013-2018-impreza-2012-2013-crosstrek-psp-eng-101bk-psp-eng-101rd-pulleys-perrin-performance-black-papsp-eng-101bk-2.jpg?v=1737769429&width=220)
Up to $56.25 off
In StockPerrin Crank Pulley
Fits: 02-26 WRX, 04-21 STI
Regular price From $118.50Sale price From $118.50 Regular priceUnit price per$158.00 -
![HKS [08-21 STI] Super SQV4 Blow Off Valve | 71008-AF013](//jdmuscleusa.com/cdn/shop/products/de442142942f97d99f33d7d76ec98154.jpg?v=1629138787&width=220)
In StockHKS Super SQV4 Blow Off Valve
Fits: 08-21 STI
Regular price $435.00Sale price $435.00 Regular priceUnit price per$435.00 -
In StockGrimmSpeed Version 2 Turbo Heat Shield
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Only 13 leftRegular price From $110.00Sale price From $110.00 Regular priceUnit price per$110.00 -
Up to $89 off
In StockTomei 08-14 WRX / 04-21 STI Equal Length Exhaust Manifold | TB6010-SB02B
Only 1 leftRegular price $801.00Sale price $801.00 Regular priceUnit price per$890.00 -
![GrimmSpeed 3in Downpipe to Stock Cat-Back Adapter [Subaru Turbo Models inc. 15-21 WRX/STI] | 077044](//jdmuscleusa.com/cdn/shop/products/grimmspeed-3in-downpipe-adapter-for-subaru-077044-exhaust-gaskets-and-hardware-grimmspeed-grm077044.jpg?v=1614517852&width=220)
GrimmSpeed 3in Downpipe to Stock Cat-Back Adapter | 077044
Fits: Subaru Turbo Models inc. 15-21 WRX/STI
Regular price $81.00Sale price $81.00 Regular priceUnit price per$81.00 -
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](//jdmuscleusa.com/cdn/shop/products/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-2623375.jpg?v=1770329179&width=220)
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](//jdmuscleusa.com/cdn/shop/files/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-7806168.jpg?v=1770329179&width=220)
In StockCOBB SF Intake Replacement Intake Filter | 712101 - For 712100,715100,724100
Fits: Subaru Models
Regular price $68.00Sale price $68.00 Regular priceUnit price per$68.00 -
![BLOX Racing [15 - 21 WRX/STI] Muffler Delete Kit - Black Tip | BXEX - 51104 - BK - JDMuscleMufflersbloBXEX-51104-BK](//jdmuscleusa.com/cdn/shop/products/blox-racing-15-21-wrxsti-muffler-delete-kit-black-tip-bxex-51104-bk-8741182.png?v=1770331331&width=220)
Up to $93.60 off
In StockBLOX Racing Muffler Delete Kit - Black Tip
Fits: 15-21 WRX/STI
Only 4 leftRegular price $374.40Sale price $374.40 Regular priceUnit price per$468.00 -
Up to $17.50 off
In StockPerrin Boost Solenoid Cover Red
Fits: 08-21 STI
Regular price $52.50Sale price $52.50 Regular priceUnit price per$70.00 -
Up to $20.50 off
In StockPerrin Stiffi Battery Tie Down Black Subaru Models
Only 14 leftRegular price $61.50Sale price $61.50 Regular priceUnit price per$82.00 -
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-8076841.jpg?v=1770328225&width=220)
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-2664053.jpg?v=1770328225&width=220)
Grimmspeed 3-Port Electronic Boost Control Solenoid
Fits: 08-21 STI
Regular price $190.00Sale price $190.00 Regular priceUnit price per$190.00
![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)
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-8998082.jpg?v=1770336383&width=220)
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-5259871.jpg?v=1770336383&width=220)
![AWE [11-21 WRX/STI Sedan] Track Cat Back Exhaust Diamond Black Quad Tips 102mm | 3020-43066](http://jdmuscleusa.com/cdn/shop/products/3020-43066.png?v=1635799857&width=220)
![AWE [11-21 WRX/STI Sedan] Track Cat Back Exhaust Diamond Black Quad Tips 102mm | 3020-43066](http://jdmuscleusa.com/cdn/shop/products/awe-track-cat-back-exhaust-subaru-wrx-sti-sedan-2011-2019-diamond-black-quad-tips-102mm-3020-43066-cat-back-exhaust-system-awe-tuning-awe3020-43066-2.jpg?v=1633201817&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048.jpg?v=1614517712&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048-2.jpg?v=1614675409&width=220)
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-black-grm090109.jpg?v=1614517802&width=220)
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-3.jpg?v=1614658473&width=220)
![Perrin [02-25 WRX, 04-21 STI] Crank Pulley | PSP-ENG-101](http://jdmuscleusa.com/cdn/shop/products/perrin-crank-pulley-wrx-2015-2018-scion-fr-s-2013-2016-subaru-brz-2013-2018-impreza-2012-2013-crosstrek-psp-eng-101bk-psp-eng-101rd-pulleys-perrin-performance.jpg?v=1737769429&width=220)
![Perrin [02-25 WRX, 04-21 STI] Crank Pulley | PSP-ENG-101](http://jdmuscleusa.com/cdn/shop/products/perrin-crank-pulley-wrx-2015-2018-scion-fr-s-2013-2016-subaru-brz-2013-2018-impreza-2012-2013-crosstrek-psp-eng-101bk-psp-eng-101rd-pulleys-perrin-performance-black-papsp-eng-101bk-2.jpg?v=1737769429&width=220)
![HKS [08-21 STI] Super SQV4 Blow Off Valve | 71008-AF013](http://jdmuscleusa.com/cdn/shop/products/de442142942f97d99f33d7d76ec98154.jpg?v=1629138787&width=220)
![GrimmSpeed 3in Downpipe to Stock Cat-Back Adapter [Subaru Turbo Models inc. 15-21 WRX/STI] | 077044](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-3in-downpipe-adapter-for-subaru-077044-exhaust-gaskets-and-hardware-grimmspeed-grm077044.jpg?v=1614517852&width=220)
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](http://jdmuscleusa.com/cdn/shop/products/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-2623375.jpg?v=1770329179&width=220)
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](http://jdmuscleusa.com/cdn/shop/files/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-7806168.jpg?v=1770329179&width=220)
![BLOX Racing [15 - 21 WRX/STI] Muffler Delete Kit - Black Tip | BXEX - 51104 - BK - JDMuscleMufflersbloBXEX-51104-BK](http://jdmuscleusa.com/cdn/shop/products/blox-racing-15-21-wrxsti-muffler-delete-kit-black-tip-bxex-51104-bk-8741182.png?v=1770331331&width=220)
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-8076841.jpg?v=1770328225&width=220)
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-2664053.jpg?v=1770328225&width=220)