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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Compressive Tuning Smart Flow Radiator Shroud SFS151 Black/Red/Silver
Fits: 15-21 WRX/STI
Regular price From $270.00Sale price From $270.00 Regular priceUnit price per$0.00 -
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](//jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012.jpg?v=1625804898&width=220)
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](//jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012-2.jpg?v=1625804898&width=220)
GrimmSpeed Alternator Cover Black | 099012
Fits: 02-14 WRX / 04-21 STI
Regular price $135.00Sale price $135.00 Regular priceUnit price per$135.00 -
![Grimmspeed [15-21 WRX/STI] Fender Shroud Kit Black | 096049](//jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-black-subaru-wrx-sti-2015-2020-096049-fender-shrouds-grimmspeed-grm096049.jpg?v=1614517743&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud Kit Black | 096049](//jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-black-subaru-wrx-sti-2015-2020-096049-fender-shrouds-grimmspeed-grm096049-2.jpg?v=1614675427&width=220)
In StockGrimmspeed Fender Shroud Kit Black | 096049
Fits: 15-21 WRX/STI
Only 3 leftRegular price $124.00Sale price $124.00 Regular priceUnit price per$124.00 -
APR 08-14 WRX / 08-21 STI Carbon Fiber Alternator Cover | CBE-WRXALT08
Regular price $154.00Sale price $154.00 Regular priceUnit price per$154.00 -
Grimmspeed Front Mount Intercooler Kit Black Core w/ Red Piping
Fits: 15-21 STI
Regular price $2,319.00Sale price $2,319.00 Regular priceUnit price per$2,319.00 -
Up to $511.42 off
In StockTurboXS Front Mount Intercooler Wrinkle Red | STI15-FMIC-RED
Fits: 15-21 STI
Regular price $1,445.00Sale price $1,445.00 Regular priceUnit price per$1,956.42 -
![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)
GrimmSpeed Intercooler Y-Pipe Gaskets | 020024
Fits: 02-07 WRX / 04-21 STI
Regular price $33.00Sale price $33.00 Regular priceUnit price per$33.00 -
Company23 Torx T70 Socket Subaru Transmission Drain Plug
Regular price $21.00Sale price $21.00 Regular priceUnit price per$21.00 -
TR Twin Scroll High Flow Catless Downpipe
Fits: 08-14 WRX, 08-18 STI
Regular price $750.00Sale price $750.00 Regular priceUnit price per$600.00 -
![Subaru OEM Tumbler to Engine Gasket [WRX/STI Subaru EJ Turbo Models] | 14035AA421](//jdmuscleusa.com/cdn/shop/products/subaru-oem-tumbler-to-engine-gasket-wrx-sti-subaru-ej-turbo-models-2002-2020-14035aa421-intake-system-gaskets-subaru-oem-sub14035aa421.jpg?v=1614543684&width=220)
Subaru OEM Tumbler to Engine Gasket | 14035AA421
Fits: WRX/STI Subaru EJ Turbo Models
Regular price $5.88Sale price $5.88 Regular priceUnit price per$5.88 -
Killer B 02-07 WRX / 04-21 STI OEM Coupler for Motorsport Extreme Flow HARD Turbo Inlet | TIEJCOE
Regular price $49.00Sale price $49.00 Regular priceUnit price per$49.00 -
Up to $21.21 off
In StockTorque Solution Stock Location Turbo Oil Feed Line
Fits: 06-14 WRX, 04-21 STI
Only 11 leftRegular price $101.00Sale price $101.00 Regular priceUnit price per$122.21 -
IAG 06-14 WRX / 04-21 STI Air / Oil Separator | AOS V2 Competition to V2 Street Series Conversion Kit | V2 AOS Only | IAG-ENG-7110
Regular price $104.99Sale price $104.99 Regular priceUnit price per$104.99 -
Up to $12 off
In StockTomei 06-14 WRX / 04-21 STI / 05-09 LGT Head Gasket 1.2mm Pair
Only 5 leftRegular price $108.00Sale price $108.00 Regular priceUnit price per$120.00 -
![ETS [15 - 21 WRX/STI] Extreme Catback Exhaust Non Resonated Burnt Tips | 200 - 30 - EXH - 008 - JDMuscleCat Back Exhaust System200-30-EXH-008](//jdmuscleusa.com/cdn/shop/files/ets-15-21-wrxsti-extreme-catback-exhaust-non-resonated-burnt-tips-200-30-exh-008-6201510.jpg?v=1770328032&width=220)
![ETS [15 - 21 WRX/STI] Extreme Catback Exhaust Non Resonated Burnt Tips | 200 - 30 - EXH - 008 - JDMuscleCat Back Exhaust System200-30-EXH-008](//jdmuscleusa.com/cdn/shop/files/ets-15-21-wrxsti-extreme-catback-exhaust-non-resonated-burnt-tips-200-30-exh-008-2604191.jpg?v=1770328032&width=220)
ETS Extreme Catback Exhaust Non Resonated Burnt Tips
Fits: 15-21 WRX/STI
Regular price $1,295.00Sale price $1,295.00 Regular priceUnit price per$1,295.00 -
Grimmspeed V2 Bypass Valve Red
Fits: 04-21 STI, 02-07 WRX
Regular price $311.00Sale price $311.00 Regular priceUnit price per$311.00
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012.jpg?v=1625804898&width=220)
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012-2.jpg?v=1625804898&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud Kit Black | 096049](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-black-subaru-wrx-sti-2015-2020-096049-fender-shrouds-grimmspeed-grm096049.jpg?v=1614517743&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud Kit Black | 096049](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-black-subaru-wrx-sti-2015-2020-096049-fender-shrouds-grimmspeed-grm096049-2.jpg?v=1614675427&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)
![Subaru OEM Tumbler to Engine Gasket [WRX/STI Subaru EJ Turbo Models] | 14035AA421](http://jdmuscleusa.com/cdn/shop/products/subaru-oem-tumbler-to-engine-gasket-wrx-sti-subaru-ej-turbo-models-2002-2020-14035aa421-intake-system-gaskets-subaru-oem-sub14035aa421.jpg?v=1614543684&width=220)
![ETS [15 - 21 WRX/STI] Extreme Catback Exhaust Non Resonated Burnt Tips | 200 - 30 - EXH - 008 - JDMuscleCat Back Exhaust System200-30-EXH-008](http://jdmuscleusa.com/cdn/shop/files/ets-15-21-wrxsti-extreme-catback-exhaust-non-resonated-burnt-tips-200-30-exh-008-6201510.jpg?v=1770328032&width=220)
![ETS [15 - 21 WRX/STI] Extreme Catback Exhaust Non Resonated Burnt Tips | 200 - 30 - EXH - 008 - JDMuscleCat Back Exhaust System200-30-EXH-008](http://jdmuscleusa.com/cdn/shop/files/ets-15-21-wrxsti-extreme-catback-exhaust-non-resonated-burnt-tips-200-30-exh-008-2604191.jpg?v=1770328032&width=220)
