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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IAG Performance Replacement Blow Off Valve Elbow Silver
Fits: 02-07 WRX, 04-21 STI
Regular price $64.99Sale price $64.99 Regular priceUnit price per$64.99 -
Subaru OEM Oil Return Hose EJ25 Turbo Models | 807515712
Regular price $12.92Sale price $12.92 Regular priceUnit price per$12.92 -
Up to $19.05 off
In StockMishimoto 02-07 WRX / 04-21 STI Aluminum Coolant Expansion Tank Black | MMRT-WRX-01EBK
Only 7 leftRegular price $188.95Sale price $188.95 Regular priceUnit price per$208.00 -
iBR FLX01 - Upgrade Kit | 3 Pin and 5 Pin Harnesses
Regular price $399.99Sale price $399.99 Regular priceUnit price per$399.99 -
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BL](//jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-1544877.jpg?v=1770328224&width=220)
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BL](//jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-2593211.jpg?v=1770328224&width=220)
In StockCOBB NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake
Fits: 15-18 STI
Only 11 leftRegular price $3,780.00Sale price $3,780.00 Regular priceUnit price per$3,780.00 -
![COBB [15 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-RED-S1-UP](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-redline-carbon-fiber-intake-4606938.jpg?v=1770328225&width=220)
![COBB [15 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-RED-S1-UP](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-redline-carbon-fiber-intake-7474132.jpg?v=1770328225&width=220)
In StockCOBB NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Redline Carbon Fiber Intake
Fits: 15-21 STI
Only 15 leftRegular price $4,025.00Sale price $4,025.00 Regular priceUnit price per$4,025.00 -
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BK](//jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-3235473.jpg?v=1770328225&width=220)
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BK](//jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-2104335.jpg?v=1770328225&width=220)
In StockCOBB NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake
Fits: 15-18 STI
Only 13 leftRegular price $3,780.00Sale price $3,780.00 Regular priceUnit price per$3,780.00 -
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BL](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-2224733.jpg?v=1770328226&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BL](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-2672938.jpg?v=1770328226&width=220)
In StockCOBB NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake
Fits: 18 STI Type RA, 19-21 STI
Only 11 leftRegular price $3,805.00Sale price $3,805.00 Regular priceUnit price per$3,805.00 -
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BK](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-3686244.jpg?v=1770328226&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BK](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-2866543.jpg?v=1770328226&width=220)
In StockCOBB NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake
Fits: 18 STI Type RA, 19-21 STI
Only 13 leftRegular price $3,805.00Sale price $3,805.00 Regular priceUnit price per$3,805.00 -
COBB EJ TGV Shaft Seal Kit
Fits: 08-21 STI , 08-14 WRX , 09-13 FXT , 07-12 LGT
Regular price $84.00Sale price $84.00 Regular priceUnit price per$84.00 -
IAG 02-14 WRX/04-21 STI/04-13 FXT/05-12 LGT Timing Guide, Comp Tensioner & Red Racing Timing Belt Kit | IAG-ENG-5130
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
IAG Red Racing Timing Belt
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-12 LGT
Regular price $229.99Sale price $229.99 Regular priceUnit price per$229.99 -
IAG Single Valve Spring and Titanium Retainer Set For Subaru EJ Engine
Regular price $329.99Sale price $329.99 Regular priceUnit price per$329.99 -
IAG 02-14 WRX/04-21 STI Timing Belt Kit with IAG Black Racing Belt, Timing Guide, Adjustable Idlers & Tensioner | IAG-ENG-5132BK
Regular price $699.99Sale price $699.99 Regular priceUnit price per$699.99 -
IAG PTFE Fuel System Kit w/ Aeromotive FPR, IAG Fuel Rails
Fits: 08-14 WRX/08-21 STI
Regular price $1,099.99Sale price $1,099.99 Regular priceUnit price per$1,099.99 -
![Turbo XS [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 13 FXT] Up - Pipe Hardware Kit | WS - UP - HW - JDMuscleExhaust Gaskets and HardwaretxsWS-UP-HW](//jdmuscleusa.com/cdn/shop/products/turbo-xs-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-up-pipe-hardware-kit-ws-up-hw-7382731.jpg?v=1770328594&width=220)
Up to $1 off
In StockTurbo XS Up-Pipe Hardware Kit | WS-UP-HW
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT
Regular price $28.00Sale price $28.00 Regular priceUnit price per$29.00
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BL](http://jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-1544877.jpg?v=1770328224&width=220)
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BL](http://jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-2593211.jpg?v=1770328224&width=220)
![COBB [15 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-RED-S1-UP](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-redline-carbon-fiber-intake-4606938.jpg?v=1770328225&width=220)
![COBB [15 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-RED-S1-UP](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-redline-carbon-fiber-intake-7474132.jpg?v=1770328225&width=220)
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-3235473.jpg?v=1770328225&width=220)
![COBB [15 - 18 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S1FF-S1-UP-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-15-18-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-2104335.jpg?v=1770328225&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BL](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-2224733.jpg?v=1770328226&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Blue Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BL](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-blue-intake-2672938.jpg?v=1770328226&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-3686244.jpg?v=1770328226&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 1 to Stage 2 + Flex Fuel Power Package Upgrade w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-S1-UP-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-1-to-stage-2-flex-fuel-power-package-upgrade-w-black-intake-2866543.jpg?v=1770328226&width=220)
![Turbo XS [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 13 FXT] Up - Pipe Hardware Kit | WS - UP - HW - JDMuscleExhaust Gaskets and HardwaretxsWS-UP-HW](http://jdmuscleusa.com/cdn/shop/products/turbo-xs-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-up-pipe-hardware-kit-ws-up-hw-7382731.jpg?v=1770328594&width=220)