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 $7 off
In StockVibrant SS Accuseal Exhaust Seal Clamp - Universal
Regular price From $15.79Sale price From $15.79 Regular priceUnit price per$20.99 -
Up to $7 off
In StockVibrant Graphite Exhaust Gasket Donut Style - Universal
Regular price From $14.99Sale price From $14.99 Regular priceUnit price per$18.99 -
Up to $16 off
In StockVibrant TC Series Heavy Duty SS Exhaust Sleeve Butt Joint Clamp - Universal
Regular price From $38.99Sale price From $38.99 Regular priceUnit price per$51.99 -
Up to $11 off
In StockVibrant Easy Seal SS Exhaust Sleeve Butt Joint Clamp - Universal
Regular price From $27.99Sale price From $27.99 Regular priceUnit price per$37.99 -
Milltek Cat Back Exhaust 3in Polished Tips WRX/STI 15-2020
Regular price $1,849.00Sale price $1,849.00 Regular priceUnit price per$0.00 -
Process West Radiator Cover Red Non Factory Intake | PRW-PWED04R
Fits: 15-21 WRX/STI
Regular price $78.65Sale price $78.65 Regular priceUnit price per$78.65 -
Process West Radiator Cover Red Factory Intake | PRW-PWED03R
Fits: 15-21 WRX/STI
Regular price $78.65Sale price $78.65 Regular priceUnit price per$78.65 -
![GrimmSpeed [02-14 WRX, 04-21 STI] Alternator Cover Red | 099017](//jdmuscleusa.com/cdn/shop/products/grimmspeed-red-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099017-alternator-covers-grimmspeed-grm099017.jpg?v=1625804048&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI] Alternator Cover Red | 099017](//jdmuscleusa.com/cdn/shop/products/AlternatorCover-7__84781.1614103288.jpg?v=1625804098&width=220)
GrimmSpeed Alternator Cover Red | 099017
Fits: 02-14 WRX, 04-21 STI
Regular price $135.00Sale price $135.00 Regular priceUnit price per$135.00 -
Grimmspeed 15-21 STI Stage 1 Power Package w/ Black Intake |191013
Regular price $603.00Sale price $603.00 Regular priceUnit price per$603.00 -
GrimmSpeed Bolt Style Clear Zinc Oil Cap Most Subaru Models | 120014C
Regular price $84.00Sale price $84.00 Regular priceUnit price per$84.00 -
Up to $70.05 off
In StockMishimoto Top Mount Intercooler Black + Red Hoses Subaru STI 2008-2019
Only 4 leftRegular price $695.95Sale price $695.95 Regular priceUnit price per$766.00 -
Up to $54.05 off
In StockMishimoto Thermostatic 19 Row Oil Cooler Kit - Universal
Only 4 leftRegular price $539.95Sale price $539.95 Regular priceUnit price per$594.00 -
Up to $43.05 off
In StockMishimoto Thermostatic 10 Row Oil Cooler Kit - Universal
Only 2 leftRegular price $428.95Sale price $428.95 Regular priceUnit price per$472.00 -
Killer B Motorsport 08-14 WRX / 08-21 STI Relocated Oil Fill Tube | OFTB-1
Regular price $197.00Sale price $197.00 Regular priceUnit price per$197.00 -
Up to $18.50 offCusco Belt Cover WRX 2008-2014 / STI 2008-2019
Regular price $166.50Sale price $166.50 Regular priceUnit price per$185.00 -
Up to $1,130.96 offAEM Infinity-10 Stand-Alone Programmable Engine Management System EMS - Universal | 30-7100
Regular price $2,908.18Sale price $2,908.18 Regular priceUnit price per$4,039.14
![GrimmSpeed [02-14 WRX, 04-21 STI] Alternator Cover Red | 099017](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-red-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099017-alternator-covers-grimmspeed-grm099017.jpg?v=1625804048&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI] Alternator Cover Red | 099017](http://jdmuscleusa.com/cdn/shop/products/AlternatorCover-7__84781.1614103288.jpg?v=1625804098&width=220)
