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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In StockCOBB NexGen Flex Fuel Ethanol Sensor Kit
Fits: 15-21 STI
Regular price $790.00Sale price $790.00 Regular priceUnit price per$790.00 -
Up to $35.05 off
In StockMishimoto Performance Aluminum Radiator Manual Transmission
Fits: 08-14 WRX, 08-21 STI
Only 20 leftRegular price $349.95Sale price $349.95 Regular priceUnit price per$385.00 -
![CSF [08 - 21 WRX/STI] 2 - Row Subaru Aluminum Radiator | B22415 - RS - JDMuscleRadiatorsCOBB22415-RS](//jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-2-row-subaru-aluminum-radiator-b22415-rs-1190897.jpg?v=1770330014&width=220)
![CSF [08 - 21 WRX/STI] 2 - Row Subaru Aluminum Radiator | B22415 - RS - JDMuscleRadiatorsCOBB22415-RS](//jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-2-row-subaru-aluminum-radiator-b22415-rs-6671145.jpg?v=1770330014&width=220)
CSF 2-Row Subaru Aluminum Radiator | B22415-RS
Fits: 08-21 WRX/STI
Regular price $398.00Sale price $398.00 Regular priceUnit price per$398.00 -
In StockCOBB Subaru EJ Turbo Blanket Black Lava
Only 9 leftRegular price $217.00Sale price $217.00 Regular priceUnit price per$217.00 -
IAG Performance Unequal Length Header & Up Pipe for 2002-2014 WRX and 2004-21 WRX STI | IAG-EXT-1000
Regular price $849.99Sale price $849.99 Regular priceUnit price per$849.99 -
IAG Performance Equal Length Header & Up Pipe for Multiple Subaru Fitments
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
Up to $28.50 off
In StockTurbosmart Blow Off Valve Kompact Dual Port Black
Fits: 02-07 WRX, 04-21 STI
Only 9 leftRegular price $256.49Sale price $256.49 Regular priceUnit price per$284.99 -
In StockCOBB Fuel Pressure Regulator For Fuel Rail Kit
Fits: 08-21 STI
Only 18 leftRegular price $380.00Sale price $380.00 Regular priceUnit price per$380.00 -
![COBB [15 - 18 STI] SF Black Intake and Airbox Package - Black/Blue | 715315 - JDMuscleIntakescobb715315-BLBlue](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-black-intake-and-airbox-package-blackblue-715315-7411081.jpg?v=1770336438&width=220)
![COBB [15 - 18 STI] SF Black Intake and Airbox Package - Black/Blue | 715315 - JDMuscleIntakescobb715315-BLBlue](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-black-intake-and-airbox-package-blackblue-715315-7126396.jpg?v=1770336438&width=220)
In StockCOBB SF Black Intake and Airbox Package-Black/Blue
Fits: 15-18 STI
Regular price $540.00Sale price $540.00 Regular priceUnit price per$540.00 -
![XForce [08-14 WRX, 08-21 STI] Pro Series Catted Downpipe | ES-SW08-KITB - JDMuscleFront Pipes and Downpipes / J-PipesES-SW08-KITB](//jdmuscleusa.com/cdn/shop/products/xforce-08-14-wrx-08-21-sti-pro-series-catted-downpipe-es-sw08-kitb-4083289.png?v=1783899632&width=220)
Up to $79.90 off
In StockXForce Pro Series Catted Downpipe | ES-SW08-KITB
Fits: 08-14 WRX, 08-21 STI
Only 10 leftRegular price $719.10Sale price $719.10 Regular priceUnit price per$799.00 -
ETS Front Mount Intercooler Core Only | 15-21 Subaru STI
Regular price From $759.00Sale price From $759.00 Regular priceUnit price per$759.00 -
GrimmSpeed Stealth Box Cold Air Intake Black | 060077
Fits: 15-21 STI
Regular price $484.00Sale price $484.00 Regular priceUnit price per$484.00 -
Up to $233.33 off
In StockSnow Performance Gas Stage 2 The New Boost Cooler Forced Induction Water/Methanol Injection Kit - Universal
Regular price $583.34Sale price $583.34 Regular priceUnit price per$816.67 -
Up to $511.42 off
In StockTurbo XS FMIC 15-21 Subaru STi - Wrinkle Black Pipes | STI15-FMIC-BLK
Only 4 leftRegular price $1,445.00Sale price $1,445.00 Regular priceUnit price per$1,956.42 -
GrimmSpeed 06-07 WRX / 04-21 STI Drive-by-Wire Throttle Body Gasket | 020010
Regular price $24.00Sale price $24.00 Regular priceUnit price per$24.00 -
In StockProthane Universal Super Grease - 0.5oz Pack of 3 - Red
Regular price $11.00Sale price $11.00 Regular priceUnit price per$11.00
![CSF [08 - 21 WRX/STI] 2 - Row Subaru Aluminum Radiator | B22415 - RS - JDMuscleRadiatorsCOBB22415-RS](http://jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-2-row-subaru-aluminum-radiator-b22415-rs-1190897.jpg?v=1770330014&width=220)
![CSF [08 - 21 WRX/STI] 2 - Row Subaru Aluminum Radiator | B22415 - RS - JDMuscleRadiatorsCOBB22415-RS](http://jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-2-row-subaru-aluminum-radiator-b22415-rs-6671145.jpg?v=1770330014&width=220)
![COBB [15 - 18 STI] SF Black Intake and Airbox Package - Black/Blue | 715315 - JDMuscleIntakescobb715315-BLBlue](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-black-intake-and-airbox-package-blackblue-715315-7411081.jpg?v=1770336438&width=220)
![COBB [15 - 18 STI] SF Black Intake and Airbox Package - Black/Blue | 715315 - JDMuscleIntakescobb715315-BLBlue](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-black-intake-and-airbox-package-blackblue-715315-7126396.jpg?v=1770336438&width=220)
![XForce [08-14 WRX, 08-21 STI] Pro Series Catted Downpipe | ES-SW08-KITB - JDMuscleFront Pipes and Downpipes / J-PipesES-SW08-KITB](http://jdmuscleusa.com/cdn/shop/products/xforce-08-14-wrx-08-21-sti-pro-series-catted-downpipe-es-sw08-kitb-4083289.png?v=1783899632&width=220)
