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
-
Up to $8.21 off
In StockTurbo XS Billet Aluminum Radiator Stay - Red
Fits: 15-21 WRX/STI
Only 10 leftRegular price $44.00Sale price $44.00 Regular priceUnit price per$52.21 -
![COBB [15 - 21 STI] Fuel Pressure Sensor Kit - JDMuscleFuel Pressure Sensorcobb315650](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-fuel-pressure-sensor-kit-8826061.jpg?v=1772946247&width=220)
![COBB [15 - 21 STI] Fuel Pressure Sensor Kit - JDMuscleFuel Pressure Sensorcobb315650](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-fuel-pressure-sensor-kit-4621393.jpg?v=1772130786&width=220)
In StockCOBB Fuel Pressure Sensor Kit
Fits: 15-21 STI
Regular price $275.00Sale price $275.00 Regular priceUnit price per$275.00 -
![XForce [11 - 21 WRX/STI Sedan] Varex Valved Cat Back Exhaust System | ESSWRX14VKCS - JDMuscleCat Back Exhaust SystemESSWRX14VKCS](//jdmuscleusa.com/cdn/shop/files/xforce-11-21-wrxsti-sedan-varex-valved-cat-back-exhaust-system-esswrx14vkcs-6989416.png?v=1770329960&width=220)
![XForce [11 - 21 WRX/STI Sedan] Varex Valved Cat Back Exhaust System | ESSWRX14VKCS - JDMuscleCat Back Exhaust SystemESSWRX14VKCS](//jdmuscleusa.com/cdn/shop/files/xforce-11-21-wrxsti-sedan-varex-valved-cat-back-exhaust-system-esswrx14vkcs-2788998.png?v=1770329960&width=220)
Up to $185 off
In StockXForce Varex Valved Cat Back Exhaust System | ESSWRX14VKCS
Fits: 11-21 WRX/STI Sedan
Only 4 leftRegular price $1,665.00Sale price $1,665.00 Regular priceUnit price per$1,850.00 -
AeroflowDynamics AFD F1 Titanium Single Exit Catback Exhaust
Fits: 15-21 WRX/STI
Regular price $799.99Sale price $799.99 Regular priceUnit price per -
IAG Air / Oil Separator | AOS
Fits: 08-14 WRX & 08-21 STI
Regular price $499.99Sale price $499.99 Regular priceUnit price per$499.99 -
IAG Air / Oil Separator | AOS
Fits: 08-14 WRX, 08-21 STI
Regular price $499.99Sale price $499.99 Regular priceUnit price per$499.99 -
![MBRP [15 - 21 WRX/STI] 3"Catback Exhaust w/ 3.5" Tips - Race Version | S4802304 - JDMuscleCat Back Exhaust SystemmbrpS4802304](//jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3catback-exhaust-w-35-tips-race-version-s4802304-3168850.jpg?v=1770327576&width=220)
![MBRP [15 - 21 WRX/STI] 3"Catback Exhaust w/ 3.5" Tips - Race Version | S4802304 - JDMuscleCat Back Exhaust SystemmbrpS4802304](//jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3catback-exhaust-w-35-tips-race-version-s4802304-6163727.png?v=1770327576&width=220)
Up to $220 off
In StockMBRP 3"Catback Exhaust w/ 3.5" Tips - Race Version
Fits: 15-21 WRX/STI
Only 8 leftRegular price $934.99Sale price $934.99 Regular priceUnit price per$1,154.99 -
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger | 070046 - JDMuscleExhaust Hangersgrm070046](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-070046-7377472.jpg?v=1770327639&width=220)
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger | 070046 - JDMuscleExhaust Hangersgrm070046](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-070046-1039545.jpg?v=1770327639&width=220)
Grimmspeed 12MM Two Position Exhaust Hanger | 070046
Fits: 08-21 WRX/STI, 05-09 LGT, 13-21 BRZ
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
![COBB [15 - 18 STI] Stage 1+ Power Package w/ Blue Intake | 616X01P - BK - JDMusclePlug and Play Engine Managementcobb616X01P-BKBlack](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-stage-1-power-package-w-blue-intake-616x01p-bk-4649811.jpg?v=1770336439&width=220)
![COBB [15 - 18 STI] Stage 1+ Power Package w/ Blue Intake | 616X01P - BK - JDMusclePlug and Play Engine Managementcobb616X01P-BKBlack](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-stage-1-power-package-w-blue-intake-616x01p-bk-3388760.jpg?v=1770336439&width=220)
In StockCOBB Stage 1+ Power Package w/ Blue Intake
Fits: 15-18 STI
Regular price $1,265.00Sale price $1,265.00 Regular priceUnit price per$1,265.00 -
![Perrin [15 - 21 WRX/STI] Radiator Shroud | Without OEM Intake Scoop - Black | PSP - ENG - 512 - 2BK - JDMuscleRadiator ShroudsperPSP-ENG-512-2BK](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-black-psp-eng-512-2bk-5883072.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud | Without OEM Intake Scoop - Black | PSP - ENG - 512 - 2BK - JDMuscleRadiator ShroudsperPSP-ENG-512-2BK](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-black-psp-eng-512-2bk-5991958.jpg?v=1770327921&width=220)
Up to $29.25 offPerrin Radiator Shroud | Without OEM Intake Scoop - Black | PSP-ENG-512-2BK
Fits: 15-21 WRX/STI
Regular price $87.75Sale price $87.75 Regular priceUnit price per$117.00 -
![Perrin [06 - 14 WRX, 07 - 21 STI, 12 - 16 Impreza, 06 - 13 FXT, 05 - 09 Legacy] Alternator Pulley Black | PSP - ENG - 119BK - JDMusclePulleysperPSP-ENG-119BK](//jdmuscleusa.com/cdn/shop/files/perrin-06-14-wrx-07-21-sti-12-16-impreza-06-13-fxt-05-09-legacy-alternator-pulley-black-psp-eng-119bk-8778143.jpg?v=1770327968&width=220)
Up to $15.25 off
In StockPerrin Alternator Pulley Black | PSP-ENG-119BK
Fits: 06-14 WRX, 07-21 STI, 12-16 Impreza, 06-13 FXT, 05-09 Legacy
Only 2 leftRegular price $45.75Sale price $45.75 Regular priceUnit price per$61.00 -
![Radium Engineering [02 - 14 WRX/STI] Top Feed Fuel Rails Black | 20 - 0567 - 02 - JDMuscleFuel Railsrad20-0567-02](//jdmuscleusa.com/cdn/shop/files/radium-engineering-02-14-wrxsti-top-feed-fuel-rails-black-20-0567-02-7682151.jpg?v=1770327979&width=220)
![Radium Engineering [02 - 14 WRX/STI] Top Feed Fuel Rails Black | 20 - 0567 - 02 - JDMuscleFuel Railsrad20-0567-02](//jdmuscleusa.com/cdn/shop/files/radium-engineering-02-14-wrxsti-top-feed-fuel-rails-black-20-0567-02-8318867.jpg?v=1770327980&width=220)
In StockRadium Engineering Top Feed Fuel Rails Black
Fits: 02-14 WRX/STI
Only 16 leftRegular price $199.45Sale price $199.45 Regular priceUnit price per$199.45 -
Grimmspeed Top Mount Intercooler - Raw
Fits: 04-21 STI, 02-07 WRX, 04-08 FXT
Regular price $999.00Sale price $999.00 Regular priceUnit price per$999.00 -
IAG V3 Black Top Feed TGV Housings with Butterfly Pass Thru
Fits: 08-14 WRX, 07-14 STI, 07-12 LGT, 09-13 FXT
Regular price $399.99Sale price $399.99 Regular priceUnit price per$399.99 -
IAG Performance 550 Series EJ25 Short Block
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Regular price $4,499.00Sale price $4,499.00 Regular priceUnit price per$0.00 -
![Killer B Motorsport 4 - 1 Holy Header Coated Subaru EJ Models [inc. 02 - 14 WRX / 04+ STI] | HH4 - 1 - SWAIN - JDMuscleExhaust Headers and ManifoldsklbHH4-1-SWAIN](//jdmuscleusa.com/cdn/shop/products/killer-b-motorsport-4-1-holy-header-coated-subaru-ej-models-inc-02-14-wrx-04-sti-hh4-1-swain-3499791.jpg?v=1770329890&width=220)
Killer B Motorsport 4-1 Holy Header Coated Subaru EJ Models | HH4-1-SWAIN
Fits: inc. 02-14 WRX / 04+ STI
Regular price $2,676.00Sale price $2,676.00 Regular priceUnit price per$2,676.00
![COBB [15 - 21 STI] Fuel Pressure Sensor Kit - JDMuscleFuel Pressure Sensorcobb315650](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-fuel-pressure-sensor-kit-8826061.jpg?v=1772946247&width=220)
![COBB [15 - 21 STI] Fuel Pressure Sensor Kit - JDMuscleFuel Pressure Sensorcobb315650](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-fuel-pressure-sensor-kit-4621393.jpg?v=1772130786&width=220)
![XForce [11 - 21 WRX/STI Sedan] Varex Valved Cat Back Exhaust System | ESSWRX14VKCS - JDMuscleCat Back Exhaust SystemESSWRX14VKCS](http://jdmuscleusa.com/cdn/shop/files/xforce-11-21-wrxsti-sedan-varex-valved-cat-back-exhaust-system-esswrx14vkcs-6989416.png?v=1770329960&width=220)
![XForce [11 - 21 WRX/STI Sedan] Varex Valved Cat Back Exhaust System | ESSWRX14VKCS - JDMuscleCat Back Exhaust SystemESSWRX14VKCS](http://jdmuscleusa.com/cdn/shop/files/xforce-11-21-wrxsti-sedan-varex-valved-cat-back-exhaust-system-esswrx14vkcs-2788998.png?v=1770329960&width=220)
![MBRP [15 - 21 WRX/STI] 3"Catback Exhaust w/ 3.5" Tips - Race Version | S4802304 - JDMuscleCat Back Exhaust SystemmbrpS4802304](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3catback-exhaust-w-35-tips-race-version-s4802304-3168850.jpg?v=1770327576&width=220)
![MBRP [15 - 21 WRX/STI] 3"Catback Exhaust w/ 3.5" Tips - Race Version | S4802304 - JDMuscleCat Back Exhaust SystemmbrpS4802304](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3catback-exhaust-w-35-tips-race-version-s4802304-6163727.png?v=1770327576&width=220)
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger | 070046 - JDMuscleExhaust Hangersgrm070046](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-070046-7377472.jpg?v=1770327639&width=220)
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger | 070046 - JDMuscleExhaust Hangersgrm070046](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-070046-1039545.jpg?v=1770327639&width=220)
![COBB [15 - 18 STI] Stage 1+ Power Package w/ Blue Intake | 616X01P - BK - JDMusclePlug and Play Engine Managementcobb616X01P-BKBlack](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-stage-1-power-package-w-blue-intake-616x01p-bk-4649811.jpg?v=1770336439&width=220)
![COBB [15 - 18 STI] Stage 1+ Power Package w/ Blue Intake | 616X01P - BK - JDMusclePlug and Play Engine Managementcobb616X01P-BKBlack](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-stage-1-power-package-w-blue-intake-616x01p-bk-3388760.jpg?v=1770336439&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud | Without OEM Intake Scoop - Black | PSP - ENG - 512 - 2BK - JDMuscleRadiator ShroudsperPSP-ENG-512-2BK](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-black-psp-eng-512-2bk-5883072.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud | Without OEM Intake Scoop - Black | PSP - ENG - 512 - 2BK - JDMuscleRadiator ShroudsperPSP-ENG-512-2BK](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-black-psp-eng-512-2bk-5991958.jpg?v=1770327921&width=220)
![Perrin [06 - 14 WRX, 07 - 21 STI, 12 - 16 Impreza, 06 - 13 FXT, 05 - 09 Legacy] Alternator Pulley Black | PSP - ENG - 119BK - JDMusclePulleysperPSP-ENG-119BK](http://jdmuscleusa.com/cdn/shop/files/perrin-06-14-wrx-07-21-sti-12-16-impreza-06-13-fxt-05-09-legacy-alternator-pulley-black-psp-eng-119bk-8778143.jpg?v=1770327968&width=220)
![Radium Engineering [02 - 14 WRX/STI] Top Feed Fuel Rails Black | 20 - 0567 - 02 - JDMuscleFuel Railsrad20-0567-02](http://jdmuscleusa.com/cdn/shop/files/radium-engineering-02-14-wrxsti-top-feed-fuel-rails-black-20-0567-02-7682151.jpg?v=1770327979&width=220)
![Radium Engineering [02 - 14 WRX/STI] Top Feed Fuel Rails Black | 20 - 0567 - 02 - JDMuscleFuel Railsrad20-0567-02](http://jdmuscleusa.com/cdn/shop/files/radium-engineering-02-14-wrxsti-top-feed-fuel-rails-black-20-0567-02-8318867.jpg?v=1770327980&width=220)
![Killer B Motorsport 4 - 1 Holy Header Coated Subaru EJ Models [inc. 02 - 14 WRX / 04+ STI] | HH4 - 1 - SWAIN - JDMuscleExhaust Headers and ManifoldsklbHH4-1-SWAIN](http://jdmuscleusa.com/cdn/shop/products/killer-b-motorsport-4-1-holy-header-coated-subaru-ej-models-inc-02-14-wrx-04-sti-hh4-1-swain-3499791.jpg?v=1770329890&width=220)