2015-2021 Subaru STI Engine Parts & Upgrades
Shop 2015-2021 subaru sti engine parts and performance upgrades at JDMuscle. We carry the top brands with guaranteed fitment for your 2015-2021 Subaru STI.
2015-2021 Subaru STI Engine
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![Torque Solution [08 - 14 WRX, 08 - 21 STI] PNP Speed Density Kit - Stainless Bung | TS - WH - 499PS - JDMuscleEngine Management SensorstqsTS-WH-499PS](//jdmuscleusa.com/cdn/shop/products/torque-solution-08-14-wrx-08-21-sti-pnp-speed-density-kit-stainless-bung-ts-wh-499ps-5839578.jpg?v=1770330487&width=220)
Up to $11.10 off
In StockTorque Solution PNP Speed Density Kit - Stainless Bung
Fits: 08-14 WRX, 08-21 STI
Only 14 leftRegular price $90.00Sale price $90.00 Regular priceUnit price per$101.10 -
In StockGReddy 15-25 WRX / 15-21 STI Type-S Polished Radiator Cap | 13911004
Only 6 leftRegular price $23.75Sale price $23.75 Regular priceUnit price per$23.75 -
![COBB [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] Throttle Body Coupler - Black | 712455 - JDMuscleThrottle Body Hosescobb712455](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-throttle-body-coupler-black-712455-6973469.jpg?v=1770336382&width=220)
In StockCobb Tuning Throttle Body Coupler - Stealth Black
Fits: 02-07 WRX, 04-21 STI, 04-08 Forester XT
Regular price $58.00Sale price $58.00 Regular priceUnit price per$58.00 -
![COBB [15 - 21 STI] Redline Carbon Fiber Intake System | 725350 - JDMuscleIntakescobb725350](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-redline-carbon-fiber-intake-system-725350-4733813.jpg?v=1770336432&width=220)
![COBB [15 - 21 STI] Redline Carbon Fiber Intake System | 725350 - JDMuscleIntakescobb725350](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-redline-carbon-fiber-intake-system-725350-2552332.jpg?v=1770336433&width=220)
In StockCobb Tuning Redline Carbon Fiber Intake System - Gloss Carbon Fiber
Fits: 15-21 STI
Regular price $875.00Sale price $875.00 Regular priceUnit price per$875.00 -
![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 Tuning 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 -
Up to $20 off
In StockRadium Engineering Fuel Rail Plumbing Kit - Parallel
Fits: 04-21 STI
Only 12 leftRegular price $379.95Sale price $379.95 Regular priceUnit price per$399.95 -
In StockGrimmspeed Front Mount Intercooler Kit Black Core w/ Red Piping
Fits: 15-21 STI
Only 1 leftRegular price $2,319.00Sale price $2,319.00 Regular priceUnit price per$2,319.00 -
Up to $4 off
In StockRadium Engineering DIY Fuel Pump Wiring Kit - Universal
Regular price $75.95Sale price $75.95 Regular priceUnit price per$79.95 -
Company23 Torx T70 Socket Subaru Transmission Drain Plug
Regular price $21.00Sale price $21.00 Regular priceUnit price per$21.00 -
Company23 Dual AVCS Exhaust Cam Sprocket Tool
Fits: 08-21 STI
Regular price $51.00Sale price $51.00 Regular priceUnit price per$51.00 -
Compressive Tuning Smart Flow Radiator Shroud SFS151 Black/Red/Silver
Fits: 15-21 WRX/STI
Regular price From $270.00Sale price From $270.00 Regular priceUnit price per$0.00 -
Up to $31.99 off
In StockEagle Connecting Rods
Fits: 02-14 WRX, 04-21 STI
Only 12 leftRegular price $375.00Sale price $375.00 Regular priceUnit price per$406.99 -
In StockCP Replacement Piston Ring
Fits: 04-19 WRX/STI EJ257/EJ255
Regular price $30.25Sale price $30.25 Regular priceUnit price per$30.25 -
Up to $74.98 offTurbo XS RFL Series Hybrid Blow Off Valve
Fits: 02-07 WRX, 04-21 STI
Regular price $250.00Sale price $250.00 Regular priceUnit price per$324.98 -
Up to $511.42 off
In StockTurboXS Front Mount Intercooler Wrinkle Red | STI15-FMIC-RED
Fits: 15-21 STI
Only 16 leftRegular price $1,445.00Sale price $1,445.00 Regular priceUnit price per$1,956.42 -
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](//jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012.jpg?v=1625804898&width=220)
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](//jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012-2.jpg?v=1625804898&width=220)
In StockGrimmSpeed Alternator Cover Black | 099012
Fits: 02-14 WRX / 04-21 STI
Only 1 leftRegular price $135.00Sale price $135.00 Regular priceUnit price per$135.00
![Torque Solution [08 - 14 WRX, 08 - 21 STI] PNP Speed Density Kit - Stainless Bung | TS - WH - 499PS - JDMuscleEngine Management SensorstqsTS-WH-499PS](http://jdmuscleusa.com/cdn/shop/products/torque-solution-08-14-wrx-08-21-sti-pnp-speed-density-kit-stainless-bung-ts-wh-499ps-5839578.jpg?v=1770330487&width=220)
![COBB [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] Throttle Body Coupler - Black | 712455 - JDMuscleThrottle Body Hosescobb712455](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-04-08-fxt-throttle-body-coupler-black-712455-6973469.jpg?v=1770336382&width=220)
![COBB [15 - 21 STI] Redline Carbon Fiber Intake System | 725350 - JDMuscleIntakescobb725350](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-redline-carbon-fiber-intake-system-725350-4733813.jpg?v=1770336432&width=220)
![COBB [15 - 21 STI] Redline Carbon Fiber Intake System | 725350 - JDMuscleIntakescobb725350](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-sti-redline-carbon-fiber-intake-system-725350-2552332.jpg?v=1770336433&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)
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012.jpg?v=1625804898&width=220)
![GrimmSpeed [02-14 WRX / 04-21 STI] Alternator Cover Black | 099012](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-black-alternator-cover-subaru-wrx-sti-forester-xt-outback-xt-099012-alternator-covers-grimmspeed-grm099012-2.jpg?v=1625804898&width=220)