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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![COBB [15 - 21 STI] NexGen Stage 1+ to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Package DealscobbSUB004NG2FF-S1P-UP](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-2682088.jpg?v=1770328224&width=220)
![COBB [15 - 21 STI] NexGen Stage 1+ to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Package DealscobbSUB004NG2FF-S1P-UP](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-3854326.jpg?v=1770328224&width=220)
In StockCOBB NexGen Stage 1+ to Stage 2 + Flex Fuel Power Package Upgrade
Fits: 15-21 STI
Only 14 leftRegular price $3,230.00Sale price $3,230.00 Regular priceUnit price per$3,230.00 -
GrimmSpeed Front Mount Intercooler Kit - Silver Core with Red Piping
Fits: 15-21 STI
Regular price $2,174.00Sale price $2,174.00 Regular priceUnit price per$2,174.00 -
Cobb WRX/STI/FXT 4 Bar MAP Sensor *Sensor Only*
Regular price $197.00Sale price $197.00 Regular priceUnit price per$197.00 -
Subaru OEM 21 STI/ 21-25 WRX/ 21-23 Crosstrek/ 21-23 Impreza Battery Tie Down Blue | SOA3881270
Regular price $83.95Sale price $83.95 Regular priceUnit price per$83.95 -
IAG Timing Belt Kit with IAG Red Racing Belt, Timing Guide, Adjustable Idlers & Tensioner
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $699.99Sale price $699.99 Regular priceUnit price per$699.99 -
IAG STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Intake Manifolds | IAG-AFD-2027BK
Regular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
IAG STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Package Process West Intake Manifolds | IAG-AFD-2028BK
Regular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
IAG Subaru STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Package Process West Intake Manifolds | IAG-AFD-2028SL
Regular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Race version | S48023CF - JDMuscleCat Back Exhaust SystemMBRS48023CF](//jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-race-version-s48023cf-9838629.jpg?v=1770329842&width=220)
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Race version | S48023CF - JDMuscleCat Back Exhaust SystemMBRS48023CF](//jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-race-version-s48023cf-6976715.jpg?v=1770329842&width=220)
Up to $247.06 off
In StockMBRP 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Race version | S48023CF
Fits: 15-21 WRX/STI
Only 13 leftRegular price $1,049.99Sale price $1,049.99 Regular priceUnit price per$1,297.05 -
Up to $36.58 off
In StockAWE 15-25 WRX/ 11-14 WRX Sedan/11-21 STI Sedan Track to Touring Conversion Kit | 3815-41006
Only 3 leftRegular price $695.00Sale price $695.00 Regular priceUnit price per$731.58 -
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](//jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-3840658.jpg?v=1770333079&width=220)
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](//jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-7574860.jpg?v=1770333079&width=220)
Cobb Tuning 4 Bar MAP Sensor Upgrade Kit
Fits: 04-20 STI, 02-07 WRX, 04-08 FXT
Regular price $236.00Sale price $236.00 Regular priceUnit price per$236.00 -
Up to $18 offBLOX Racing Air Box Intake Hose - Black
Fits: 08-14 WRX, 08-20 STI
Regular price $72.00Sale price $72.00 Regular priceUnit price per$90.00 -
![Cobb [15 - 19 WRX/STi] Titanium 3in Catback Exhaust Replacement Hardware Kit - JDMuscleExhaust Gaskets and Hardwarecobb515140-HW](//jdmuscleusa.com/cdn/shop/products/cobb-15-19-wrxsti-titanium-3in-catback-exhaust-replacement-hardware-kit-4382989.jpg?v=1770330433&width=220)
![Cobb [15 - 19 WRX/STi] Titanium 3in Catback Exhaust Replacement Hardware Kit - JDMuscleExhaust Gaskets and Hardwarecobb515140-HW](//jdmuscleusa.com/cdn/shop/products/cobb-15-19-wrxsti-titanium-3in-catback-exhaust-replacement-hardware-kit-3528128.jpg?v=1770330433&width=220)
Cobb Titanium 3in Catback Exhaust Replacement Hardware Kit
Fits: 15-19 WRX/STi
Regular price $53.00Sale price $53.00 Regular priceUnit price per$53.00 -
![Cobb [15 - 21 STI Type RA 2018] Stage 1 + Redline Carbon Fiber Power Package - JDMuscleEngine Package DealscobbSUB0040S1P-RED](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-type-ra-2018-stage-1-redline-carbon-fiber-power-package-3847849.jpg?v=1770330622&width=220)
![Cobb [15 - 21 STI Type RA 2018] Stage 1 + Redline Carbon Fiber Power Package - JDMuscleEngine Package DealscobbSUB0040S1P-RED](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-type-ra-2018-stage-1-redline-carbon-fiber-power-package-3143991.jpg?v=1770330622&width=220)
In StockCobb Stage 1 + Redline Carbon Fiber Power Package
Fits: 15-21 STI Type RA 2018
Regular price $1,485.00Sale price $1,485.00 Regular priceUnit price per$1,485.00 -
COBB Subaru Impreza WRX or STI Cat-Back Exhaust Replacement Hardware Kit Gasket and bolts
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
In StockCobb 3in 2-Bolt Exhaust Gasket
Only 1 leftRegular price $25.00Sale price $25.00 Regular priceUnit price per$25.00
![COBB [15 - 21 STI] NexGen Stage 1+ to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Package DealscobbSUB004NG2FF-S1P-UP](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-2682088.jpg?v=1770328224&width=220)
![COBB [15 - 21 STI] NexGen Stage 1+ to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Package DealscobbSUB004NG2FF-S1P-UP](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-3854326.jpg?v=1770328224&width=220)
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Race version | S48023CF - JDMuscleCat Back Exhaust SystemMBRS48023CF](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-race-version-s48023cf-9838629.jpg?v=1770329842&width=220)
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Race version | S48023CF - JDMuscleCat Back Exhaust SystemMBRS48023CF](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-race-version-s48023cf-6976715.jpg?v=1770329842&width=220)
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](http://jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-3840658.jpg?v=1770333079&width=220)
![Cobb Tuning [04 - 20 STI, 02 - 07 WRX, 04 - 08 FXT] 4 Bar MAP Sensor Upgrade Kit - JDMuscleEngine Management SensorscobbA12700](http://jdmuscleusa.com/cdn/shop/products/cobb-tuning-04-20-sti-02-07-wrx-04-08-fxt-4-bar-map-sensor-upgrade-kit-7574860.jpg?v=1770333079&width=220)
![Cobb [15 - 19 WRX/STi] Titanium 3in Catback Exhaust Replacement Hardware Kit - JDMuscleExhaust Gaskets and Hardwarecobb515140-HW](http://jdmuscleusa.com/cdn/shop/products/cobb-15-19-wrxsti-titanium-3in-catback-exhaust-replacement-hardware-kit-4382989.jpg?v=1770330433&width=220)
![Cobb [15 - 19 WRX/STi] Titanium 3in Catback Exhaust Replacement Hardware Kit - JDMuscleExhaust Gaskets and Hardwarecobb515140-HW](http://jdmuscleusa.com/cdn/shop/products/cobb-15-19-wrxsti-titanium-3in-catback-exhaust-replacement-hardware-kit-3528128.jpg?v=1770330433&width=220)
![Cobb [15 - 21 STI Type RA 2018] Stage 1 + Redline Carbon Fiber Power Package - JDMuscleEngine Package DealscobbSUB0040S1P-RED](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-type-ra-2018-stage-1-redline-carbon-fiber-power-package-3847849.jpg?v=1770330622&width=220)
![Cobb [15 - 21 STI Type RA 2018] Stage 1 + Redline Carbon Fiber Power Package - JDMuscleEngine Package DealscobbSUB0040S1P-RED](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-type-ra-2018-stage-1-redline-carbon-fiber-power-package-3143991.jpg?v=1770330622&width=220)
