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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Up to $12.05 off
In StockMishimoto Slim Electric Fan - Universal
Regular price From $66.75Sale price From $66.75 Regular priceUnit price per$0.00 -
Up to $3.57 off
In StockMishimoto Straight Coupler 2.5-in D X 3-in L - Universal
Regular price From $11.95Sale price From $11.95 Regular priceUnit price per$13.00 -
Up to $7.05 off
In StockMishimoto Oil Block Sandwich Adaptor - Universal | MMOP-TPS
Only 19 leftRegular price $66.95Sale price $66.95 Regular priceUnit price per$74.00 -
![OVERTAKE [04-21 STI, 06-07 WRX] Drive-By-Wire Throttle Body Gasket](//jdmuscleusa.com/cdn/shop/files/a10479-overtake-drive-by-wire-throttle-body-gasket-1.jpg?v=1784218225&width=220)
![OVERTAKE [04-21 STI, 06-07 WRX] Drive-By-Wire Throttle Body Gasket](//jdmuscleusa.com/cdn/shop/files/a10479-overtake-drive-by-wire-throttle-body-gasket-2.jpg?v=1784218226&width=220)
In StockOVERTAKE Drive-By-Wire Throttle Body Gasket
Fits: 04-21 STI, 06-07 WRX
Regular price $9.00Sale price $9.00 Regular priceUnit price per$9.00 -
![OVERTAKE [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 OBXT/LGT] Turbo Heatshield Reflective Gold Foil](//jdmuscleusa.com/cdn/shop/files/A10927-overtake-turbo-heatshield-foil-2.jpg?v=1784218225&width=220)
![OVERTAKE [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 OBXT/LGT] Turbo Heatshield Reflective Gold Foil](//jdmuscleusa.com/cdn/shop/files/A10927-overtake-turbo-heatshield-foil-1.jpg?v=1784218225&width=220)
In StockOVERTAKE Turbo Heatshield Reflective Gold Foil
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 OBXT/LGT
Regular price $45.00Sale price $45.00 Regular priceUnit price per -
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Non-Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.1.0](//jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-non-resonated-1400021.webp?v=1783694537&width=220)
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Non-Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.1.0](//jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-non-resonated-9263833.webp?v=1783694538&width=220)
GrimmSpeed “Gentleman’s Exhaust” V2 Catback System – Non-Resonated
Fits: 15–21 WRX/STI
Regular price $1,299.00Sale price $1,299.00 Regular priceUnit price per -
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.2.0](//jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-resonated-3569586.webp?v=1783694537&width=220)
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.2.0](//jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-resonated-7309290.webp?v=1783694537&width=220)
GrimmSpeed “Gentleman’s Exhaust” V2 Catback System – Resonated
Fits: 15–21 WRX/STI
Regular price $1,399.00Sale price $1,399.00 Regular priceUnit price per -
Up to $6 off
In StockOVERTAKE Catback Exhaust Refresh Kit - 3in. Single Exit
Fits: 02-26 WRX, 04-21 STI, 13-26 BRZ, 13-26 GR86
Only 16 leftRegular price $49.00Sale price $49.00 Regular priceUnit price per$55.00 -
![Cobb [02 - 21 WRX/STI/ Forester XT/ Legacy GT] Turbo Blanket - JDMuscleTurboscobb821650](//jdmuscleusa.com/cdn/shop/products/cobb-02-21-wrxsti-forester-xt-legacy-gt-turbo-blanket-4502243.jpg?v=1775590691&width=220)
![Cobb [02 - 21 WRX/STI/ Forester XT/ Legacy GT] Turbo Blanket - JDMuscleTurboscobb821650](//jdmuscleusa.com/cdn/shop/products/cobb-02-21-wrxsti-forester-xt-legacy-gt-turbo-blanket-4931254.jpg?v=1775590691&width=220)
Cobb Turbo Blanket
Fits: 02-14 WRX, 04-21 STI
Regular price $139.50Sale price $139.50 Regular priceUnit price per$139.50 -
![Perrin Performance [02 - 14 Subaru Impreza, 15 - 21 WRX, STI] Oil Cooler Tuner Kit - JDMuscleOil Cooler / Transmission CoolerperPSP-OIL-125](//jdmuscleusa.com/cdn/shop/files/perrin-performance-02-14-subaru-impreza-15-21-wrx-sti-oil-cooler-tuner-kit-9279167.jpg?v=1770322451&width=220)
![Perrin Performance [02 - 14 Subaru Impreza, 15 - 21 WRX, STI] Oil Cooler Tuner Kit - JDMuscleOil Cooler / Transmission CoolerperPSP-OIL-125](//jdmuscleusa.com/cdn/shop/files/perrin-performance-02-14-subaru-impreza-15-21-wrx-sti-oil-cooler-tuner-kit-9010308.jpg?v=1770322451&width=220)
Up to $147.25 offPerrin Performance Oil Cooler Tuner Kit
Fits: 02-14 Subaru Impreza, 15-21 WRX, STI
Regular price $441.75Sale price $441.75 Regular priceUnit price per$589.00 -
![[04 - 17 STI] FactionFab Slotted Front Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10290.1](//jdmuscleusa.com/cdn/shop/files/04-17-sti-factionfab-slotted-front-rotor-v2-dual-drilled-5x100114-5707576.jpg?v=1772881220&width=220)
![[04 - 17 STI] FactionFab Slotted Front Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10290.1](//jdmuscleusa.com/cdn/shop/files/04-17-sti-factionfab-slotted-front-rotor-v2-dual-drilled-5x100114-2712122.jpg?v=1772881220&width=220)
In StockFactionFab Slotted Front Rotor V2 Dual Drilled 5x100/114
Fits: 04-17 STI
Regular price $145.00Sale price $145.00 Regular priceUnit price per$145.00 -
FactionFab FR-Spec Coilover Replacement Rear Strut. To be used with FFA1.10176.2/FFA1.10177.2
Fits: 08-14 STI, 15-21 WRX/STI
Regular price $150.00Sale price $150.00 Regular priceUnit price per$150.00 -
![[18 - 21 STI] FactionFab Slotted Rear Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10297.1](//jdmuscleusa.com/cdn/shop/files/18-21-sti-factionfab-slotted-rear-rotor-v2-dual-drilled-5x100114-9254905.jpg?v=1772881220&width=220)
![[18 - 21 STI] FactionFab Slotted Rear Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10297.1](//jdmuscleusa.com/cdn/shop/files/18-21-sti-factionfab-slotted-rear-rotor-v2-dual-drilled-5x100114-1851849.jpg?v=1772881220&width=220)
In StockFactionFab Slotted Rear Rotor V2 Dual Drilled 5x100/114
Fits: 18-21 STI
Regular price $175.00Sale price $175.00 Regular priceUnit price per$175.00 -
In StockFactionFab OE Line Subaru EJ Turbo to Downpipe Gasket
Regular price $12.00Sale price $12.00 Regular priceUnit price per$12.00 -
Up to $20.31 off
Perrin Performance Long Exhaust Hanger Kit for Subaru WRX/STI, Impreza, BRZ/GR86 (5 Pieces)
Regular price $60.94Sale price $60.94 Regular priceUnit price per$81.25 -
![PERRIN [08-26 WRX/STI/Impreza, 13-26 BRZ/GR86] Standard Length Exhaust Hanger Kit (5 pcs) - JDMuscleExhaust HangersperPSP-EXT-701](//jdmuscleusa.com/cdn/shop/files/perrin-08-26-wrxstiimpreza-13-26-brzgr86-standard-length-exhaust-hanger-kit-5-pcs-7104191.jpg?v=1780986609&width=220)
![PERRIN [08-26 WRX/STI/Impreza, 13-26 BRZ/GR86] Standard Length Exhaust Hanger Kit (5 pcs) - JDMuscleExhaust HangersperPSP-EXT-701](//jdmuscleusa.com/cdn/shop/files/perrin-08-26-wrxstiimpreza-13-26-brzgr86-standard-length-exhaust-hanger-kit-5-pcs-1029392.jpg?v=1780986609&width=220)
Up to $20.31 off
In StockPERRIN Standard Length Exhaust Hanger Kit (5 pcs)
Fits: 08-26 WRX/STI/Impreza, 13-26 BRZ/GR86
Only 2 leftRegular price $60.94Sale price $60.94 Regular priceUnit price per$81.25
![OVERTAKE [04-21 STI, 06-07 WRX] Drive-By-Wire Throttle Body Gasket](http://jdmuscleusa.com/cdn/shop/files/a10479-overtake-drive-by-wire-throttle-body-gasket-1.jpg?v=1784218225&width=220)
![OVERTAKE [04-21 STI, 06-07 WRX] Drive-By-Wire Throttle Body Gasket](http://jdmuscleusa.com/cdn/shop/files/a10479-overtake-drive-by-wire-throttle-body-gasket-2.jpg?v=1784218226&width=220)
![OVERTAKE [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 OBXT/LGT] Turbo Heatshield Reflective Gold Foil](http://jdmuscleusa.com/cdn/shop/files/A10927-overtake-turbo-heatshield-foil-2.jpg?v=1784218225&width=220)
![OVERTAKE [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 OBXT/LGT] Turbo Heatshield Reflective Gold Foil](http://jdmuscleusa.com/cdn/shop/files/A10927-overtake-turbo-heatshield-foil-1.jpg?v=1784218225&width=220)
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Non-Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.1.0](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-non-resonated-1400021.webp?v=1783694537&width=220)
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Non-Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.1.0](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-non-resonated-9263833.webp?v=1783694538&width=220)
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.2.0](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-resonated-3569586.webp?v=1783694537&width=220)
![GrimmSpeed [15–21 WRX/STI] “Gentleman’s Exhaust” V2 Catback System – Resonated - JDMuscleCat Back Exhaust SystemGRM.1025.2.0](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-15-21-wrxsti-gentlemans-exhaust-v2-catback-system-resonated-7309290.webp?v=1783694537&width=220)
![Cobb [02 - 21 WRX/STI/ Forester XT/ Legacy GT] Turbo Blanket - JDMuscleTurboscobb821650](http://jdmuscleusa.com/cdn/shop/products/cobb-02-21-wrxsti-forester-xt-legacy-gt-turbo-blanket-4502243.jpg?v=1775590691&width=220)
![Cobb [02 - 21 WRX/STI/ Forester XT/ Legacy GT] Turbo Blanket - JDMuscleTurboscobb821650](http://jdmuscleusa.com/cdn/shop/products/cobb-02-21-wrxsti-forester-xt-legacy-gt-turbo-blanket-4931254.jpg?v=1775590691&width=220)
![Perrin Performance [02 - 14 Subaru Impreza, 15 - 21 WRX, STI] Oil Cooler Tuner Kit - JDMuscleOil Cooler / Transmission CoolerperPSP-OIL-125](http://jdmuscleusa.com/cdn/shop/files/perrin-performance-02-14-subaru-impreza-15-21-wrx-sti-oil-cooler-tuner-kit-9279167.jpg?v=1770322451&width=220)
![Perrin Performance [02 - 14 Subaru Impreza, 15 - 21 WRX, STI] Oil Cooler Tuner Kit - JDMuscleOil Cooler / Transmission CoolerperPSP-OIL-125](http://jdmuscleusa.com/cdn/shop/files/perrin-performance-02-14-subaru-impreza-15-21-wrx-sti-oil-cooler-tuner-kit-9010308.jpg?v=1770322451&width=220)
![[04 - 17 STI] FactionFab Slotted Front Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10290.1](http://jdmuscleusa.com/cdn/shop/files/04-17-sti-factionfab-slotted-front-rotor-v2-dual-drilled-5x100114-5707576.jpg?v=1772881220&width=220)
![[04 - 17 STI] FactionFab Slotted Front Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10290.1](http://jdmuscleusa.com/cdn/shop/files/04-17-sti-factionfab-slotted-front-rotor-v2-dual-drilled-5x100114-2712122.jpg?v=1772881220&width=220)
![[18 - 21 STI] FactionFab Slotted Rear Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10297.1](http://jdmuscleusa.com/cdn/shop/files/18-21-sti-factionfab-slotted-rear-rotor-v2-dual-drilled-5x100114-9254905.jpg?v=1772881220&width=220)
![[18 - 21 STI] FactionFab Slotted Rear Rotor V2 Dual Drilled 5x100/114 - JDMuscleBrake RotorsFFA1.10297.1](http://jdmuscleusa.com/cdn/shop/files/18-21-sti-factionfab-slotted-rear-rotor-v2-dual-drilled-5x100114-1851849.jpg?v=1772881220&width=220)
![PERRIN [08-26 WRX/STI/Impreza, 13-26 BRZ/GR86] Standard Length Exhaust Hanger Kit (5 pcs) - JDMuscleExhaust HangersperPSP-EXT-701](http://jdmuscleusa.com/cdn/shop/files/perrin-08-26-wrxstiimpreza-13-26-brzgr86-standard-length-exhaust-hanger-kit-5-pcs-7104191.jpg?v=1780986609&width=220)
![PERRIN [08-26 WRX/STI/Impreza, 13-26 BRZ/GR86] Standard Length Exhaust Hanger Kit (5 pcs) - JDMuscleExhaust HangersperPSP-EXT-701](http://jdmuscleusa.com/cdn/shop/files/perrin-08-26-wrxstiimpreza-13-26-brzgr86-standard-length-exhaust-hanger-kit-5-pcs-1029392.jpg?v=1780986609&width=220)