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 - 18 STI] SS 3in Turbo Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515332](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-ss-3in-turbo-back-exhaust-6959238.jpg?v=1770336270&width=220)
![Cobb [15 - 18 STI] SS 3in Turbo Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515332](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-ss-3in-turbo-back-exhaust-3804806.jpg?v=1770336270&width=220)
Cobb SS 3in Turbo Back Exhaust
Fits: 15-18 STI
Regular price $2,265.00Sale price $2,265.00 Regular priceUnit price per$2,265.00 -
![COBB [19 - 21 STI , 18 STI Type RA] SF Airbox - JDMuscleAir Boxescobb716100](//jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-airbox-7095873.jpg?v=1770336329&width=220)
![COBB [19 - 21 STI , 18 STI Type RA] SF Airbox - JDMuscleAir Boxescobb716100](//jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-airbox-3188210.jpg?v=1770336330&width=220)
In StockCOBB SF Airbox
Fits: 19-21 STI , 18 STI Type RA
Regular price $290.00Sale price $290.00 Regular priceUnit price per$290.00 -
![Cobb [15 - 21 STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobbSUBFMIC001SL](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-front-mount-intercooler-kit-silver-2009843.jpg?v=1770336331&width=220)
![Cobb [15 - 21 STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobbSUBFMIC001SL](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-front-mount-intercooler-kit-silver-6814149.jpg?v=1770336331&width=220)
In StockCobb Front Mount Intercooler Kit Silver
Fits: 15-21 STI
Only 5 leftRegular price $2,435.00Sale price $2,435.00 Regular priceUnit price per$2,435.00 -
![COBB [08 - 21 STI] Fuel Pressure Regulator Manifold Relocation Kit - JDMuscleFuel Pressure Regulatorscobb315150](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-pressure-regulator-manifold-relocation-kit-1397733.jpg?v=1770336328&width=220)
In StockCOBB Fuel Pressure Regulator Manifold Relocation Kit
Fits: 08-21 STI
Only 1 leftRegular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
![Cobb [04 - 16 STI, 06 - 21] WRX AN Adapter Fittings - JDMuscleEngine Management Sensorscobb312630](//jdmuscleusa.com/cdn/shop/products/cobb-04-16-sti-06-21-wrx-an-adapter-fittings-3943173.jpg?v=1770336368&width=220)
![Cobb [04 - 16 STI, 06 - 21] WRX AN Adapter Fittings - JDMuscleEngine Management Sensorscobb312630](//jdmuscleusa.com/cdn/shop/files/cobb-04-16-sti-06-21-wrx-an-adapter-fittings-8477907.webp?v=1770336368&width=220)
In StockCobb AN Adapter Fittings
Fits: 04-16 STI, 06-21 WRX
Only 8 leftRegular price $53.00Sale price $53.00 Regular priceUnit price per$53.00 -
![COBB [11 - 21 WRX/STI] Sedan Titanium Cat Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515140](//jdmuscleusa.com/cdn/shop/products/cobb-11-21-wrxsti-sedan-titanium-cat-back-exhaust-9553676.jpg?v=1770336373&width=220)
![COBB [11 - 21 WRX/STI] Sedan Titanium Cat Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515140](//jdmuscleusa.com/cdn/shop/products/cobb-11-21-wrxsti-sedan-titanium-cat-back-exhaust-2181981.jpg?v=1770336373&width=220)
COBB Titanium Cat Back Exhaust
Fits: 11-21 WRX/STI Sedan*
Regular price $2,450.00Sale price $2,450.00 Regular priceUnit price per$2,450.00 -
![Cobb [08 - 21 STI] Fuel System Package + Flex Fuel - JDMuscleFlex FuelcobbSUB000FSFF](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-system-package-flex-fuel-7366625.jpg?v=1775590694&width=220)
![Cobb [08 - 21 STI] Fuel System Package + Flex Fuel - JDMuscleFlex FuelcobbSUB000FSFF](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-system-package-flex-fuel-1808390.jpg?v=1775590694&width=220)
Cobb Fuel System Package + Flex Fuel
Fits: 08-21 STI
Regular price $2,660.00Sale price $2,660.00 Regular priceUnit price per$2,660.00 -
![Cobb [08 - 21 STI] Fuel Rail Line Kit to Flex Fuel - JDMuscleFuel Railscobb315260](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-rail-line-kit-to-flex-fuel-5673463.jpg?v=1775590689&width=220)
![Cobb [08 - 21 STI] Fuel Rail Line Kit to Flex Fuel - JDMuscleFuel Railscobb315260](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-rail-line-kit-to-flex-fuel-2516991.jpg?v=1775590689&width=220)
Cobb Fuel Rail Line Kit to Flex Fuel
Fits: 08-21 STI
Regular price $175.00Sale price $175.00 Regular priceUnit price per$175.00 -
In StockCobb Front Mount Intercooler Bypass Valve Adapter
Fits: 02-07 WRX, 04-21 STI
Only 16 leftRegular price $87.00Sale price $87.00 Regular priceUnit price per$87.00 -
In StockCobb SF Intake System Hardware Kit
Fits: 08-14 WRX, 08-21 STI
Only 9 leftRegular price $16.00Sale price $16.00 Regular priceUnit price per$16.00 -
![Cobb [08 - 14 WRX, 08 - 21 STI] Flex Fuel + Fuel Upgrade Package - JDMuscleFlex FuelcobbSUB0FF0050](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-flex-fuel-fuel-upgrade-package-3039725.jpg?v=1775590818&width=220)
![Cobb [08 - 14 WRX, 08 - 21 STI] Flex Fuel + Fuel Upgrade Package - JDMuscleFlex FuelcobbSUB0FF0050](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-flex-fuel-fuel-upgrade-package-4485216.jpg?v=1775590818&width=220)
Cobb Flex Fuel + Fuel Upgrade Package
Fits: 08-14 WRX, 08-21 STI
Regular price $1,485.00Sale price $1,485.00 Regular priceUnit price per$1,485.00 -
Rexpeed CS-Style Carbon Fiber Air Intake Cover Subaru 2015+ WRX / 2015+ STI | G60
Regular price $550.00Sale price $550.00 Regular priceUnit price per$350.00 -
Rexpeed CS-Style Carbon Fiber Cooling Air Plate WRX 15-2020 / STI 15-2020 | G59
Regular price $550.00Sale price $550.00 Regular priceUnit price per$350.00 -
TR Unequal Length Exhaust Manifold w/ Up-pipe for Subaru 2002-2014 WRX / 2004+ STI | TR-ES1000
Regular price $990.00Sale price $990.00 Regular priceUnit price per$860.00 -
TR TD05-20G Turbo Subaru 2002-2007 WRX / 2004+ STI | TR-TS1001
Regular price $1,520.00Sale price $1,520.00 Regular priceUnit price per$1,325.00 -
TR TD05-16G Turbo Subaru 2002-2007 WRX / 2004+ STI | TR-TS1002
Regular price $1,180.00Sale price $1,180.00 Regular priceUnit price per$1,030.00
![Cobb [15 - 18 STI] SS 3in Turbo Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515332](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-ss-3in-turbo-back-exhaust-6959238.jpg?v=1770336270&width=220)
![Cobb [15 - 18 STI] SS 3in Turbo Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515332](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-ss-3in-turbo-back-exhaust-3804806.jpg?v=1770336270&width=220)
![COBB [19 - 21 STI , 18 STI Type RA] SF Airbox - JDMuscleAir Boxescobb716100](http://jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-airbox-7095873.jpg?v=1770336329&width=220)
![COBB [19 - 21 STI , 18 STI Type RA] SF Airbox - JDMuscleAir Boxescobb716100](http://jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-airbox-3188210.jpg?v=1770336330&width=220)
![Cobb [15 - 21 STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobbSUBFMIC001SL](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-front-mount-intercooler-kit-silver-2009843.jpg?v=1770336331&width=220)
![Cobb [15 - 21 STI] Front Mount Intercooler Kit Silver - JDMuscleIntercoolerscobbSUBFMIC001SL](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-front-mount-intercooler-kit-silver-6814149.jpg?v=1770336331&width=220)
![COBB [08 - 21 STI] Fuel Pressure Regulator Manifold Relocation Kit - JDMuscleFuel Pressure Regulatorscobb315150](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-pressure-regulator-manifold-relocation-kit-1397733.jpg?v=1770336328&width=220)
![Cobb [04 - 16 STI, 06 - 21] WRX AN Adapter Fittings - JDMuscleEngine Management Sensorscobb312630](http://jdmuscleusa.com/cdn/shop/products/cobb-04-16-sti-06-21-wrx-an-adapter-fittings-3943173.jpg?v=1770336368&width=220)
![Cobb [04 - 16 STI, 06 - 21] WRX AN Adapter Fittings - JDMuscleEngine Management Sensorscobb312630](http://jdmuscleusa.com/cdn/shop/files/cobb-04-16-sti-06-21-wrx-an-adapter-fittings-8477907.webp?v=1770336368&width=220)
![COBB [11 - 21 WRX/STI] Sedan Titanium Cat Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515140](http://jdmuscleusa.com/cdn/shop/products/cobb-11-21-wrxsti-sedan-titanium-cat-back-exhaust-9553676.jpg?v=1770336373&width=220)
![COBB [11 - 21 WRX/STI] Sedan Titanium Cat Back Exhaust - JDMuscleCat Back Exhaust Systemcobb515140](http://jdmuscleusa.com/cdn/shop/products/cobb-11-21-wrxsti-sedan-titanium-cat-back-exhaust-2181981.jpg?v=1770336373&width=220)
![Cobb [08 - 21 STI] Fuel System Package + Flex Fuel - JDMuscleFlex FuelcobbSUB000FSFF](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-system-package-flex-fuel-7366625.jpg?v=1775590694&width=220)
![Cobb [08 - 21 STI] Fuel System Package + Flex Fuel - JDMuscleFlex FuelcobbSUB000FSFF](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-system-package-flex-fuel-1808390.jpg?v=1775590694&width=220)
![Cobb [08 - 21 STI] Fuel Rail Line Kit to Flex Fuel - JDMuscleFuel Railscobb315260](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-rail-line-kit-to-flex-fuel-5673463.jpg?v=1775590689&width=220)
![Cobb [08 - 21 STI] Fuel Rail Line Kit to Flex Fuel - JDMuscleFuel Railscobb315260](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-fuel-rail-line-kit-to-flex-fuel-2516991.jpg?v=1775590689&width=220)
![Cobb [08 - 14 WRX, 08 - 21 STI] Flex Fuel + Fuel Upgrade Package - JDMuscleFlex FuelcobbSUB0FF0050](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-flex-fuel-fuel-upgrade-package-3039725.jpg?v=1775590818&width=220)
![Cobb [08 - 14 WRX, 08 - 21 STI] Flex Fuel + Fuel Upgrade Package - JDMuscleFlex FuelcobbSUB0FF0050](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-flex-fuel-fuel-upgrade-package-4485216.jpg?v=1775590818&width=220)
