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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Subaru OEM Donut Gasket Subaru Turbo Models | 44022AA123
Regular price $24.70Sale price $24.70 Regular priceUnit price per$24.70 -
Up to $20 off
In StockRadium Engineering Fuel Rail Plumbing Kit - Parallel
Fits: 04-21 STI
Only 9 leftRegular price $379.95Sale price $379.95 Regular priceUnit price per$399.95 -
![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 Throttle Body Coupler-Black
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 19 leftRegular 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 Redline Carbon Fiber Intake System
Fits: 15-21 STI
Regular price $875.00Sale price $875.00 Regular priceUnit price per$875.00 -
![Perrin [08-21 STI] Top Mount Intercooler Black | PSP-ITR-302BK](//jdmuscleusa.com/cdn/shop/products/9f8361e7abd0588b383bc267ccb73ca6.jpg?v=1737769259&width=220)
![Perrin [08-21 STI] Top Mount Intercooler Black | PSP-ITR-302BK](//jdmuscleusa.com/cdn/shop/products/abd6cdc1de7714314dfa4182b88b9d6f.jpg?v=1737769259&width=220)
Up to $232.50 off
In StockPerrin Top Mount Intercooler Black
Fits: 08-21 STI
Only 11 leftRegular price $697.50Sale price $697.50 Regular priceUnit price per$930.00 -
![Perrin [18-21 STI] Cold Air Intake - Red](//jdmuscleusa.com/cdn/shop/files/e9edcae1eb79d0a927baa1de2116feb9.jpg?v=1760370974&width=220)
![Perrin [18-21 STI] Cold Air Intake - Red](//jdmuscleusa.com/cdn/shop/files/ffd45cdf1196a35b62cd21c085b3710c.jpg?v=1760370974&width=220)
Up to $85 off
In StockPerrin Cold Air Intake - Red
Fits: 18-21 STI
Only 19 leftRegular price $255.00Sale price $255.00 Regular priceUnit price per$340.00 -
Up to $41.05 off
In StockMishimoto Performance Cold Air Intake
Fits: 15-21 STI
Only 5 leftRegular price From $368.95Sale price From $368.95 Regular priceUnit price per$406.00 -
Up to $92.98 off
In StockTurboXS RFL Blow Off Valve
Fits: 02-07 WRX, 04-21 STI
Regular price $232.00Sale price $232.00 Regular priceUnit price per$324.98 -
Up to $29.25 off
In StockPerrin Turbo Heat Shield Turbo | PSP-EXT-001
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-05 FXT
Regular price $87.75Sale price $87.75 Regular priceUnit price per$117.00 -
![GrimmSpeed [02-14 WRX, 04-21 STI] TGV to Engine Gasket Pair | 032001](//jdmuscleusa.com/cdn/shop/products/grimmspeed-tumbler-to-engine-gaskets-for-subaru-gasket-032001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-032001.jpg?v=1614517838&width=220)
GrimmSpeed TGV to Engine Gasket Pair | 032001
Fits: 02-14 WRX, 04-21 STI
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
In StockCP Replacement Piston Ring
Fits: 04-19 WRX/STI EJ257/EJ255
Only 13 leftRegular price $30.25Sale price $30.25 Regular priceUnit price per$30.25 -
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 -
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall Burnt Tips | RO-TTVA-S](//jdmuscleusa.com/cdn/shop/files/remark-stainless-steel-axle-back-w-single-wall-burnt-tips-2015-2021-wrx-2015-2021-sti-ro-ttva-s-134440_626x418_254219c0-e39d-4ec0-a0f7-60bc3b1d2ddf.jpg?v=1745512174&width=220)
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall Burnt Tips | RO-TTVA-S](//jdmuscleusa.com/cdn/shop/files/remark-stainless-steel-axle-back-w-single-wall-burnt-tips-2015-2021-wrx-2015-2021-sti-ro-ttva-s-944538_626x501_56c78d8a-b13a-4acb-b7e6-54c8d0b67ead.jpg?v=1745512174&width=220)
In StockRemark Stainless Steel Axle Back w/ Single Wall Burnt Tips
Fits: 15-21 WRX/STI
Only 4 leftRegular price $695.00Sale price $695.00 Regular priceUnit price per$695.00 -
Killer B Motorsport 02-14 WRX / 04-21 STI 4-1 Holy Header Exhaust Manifold 2 Bolt | HH-2BOLT
Regular price $1,539.00Sale price $1,539.00 Regular priceUnit price per$1,539.00 -
Up to $774.80 off
In StockInvidia Q300 Cat Back Exhaust w/ Double Wall Stainless Steel Tips | HS15STIG3S
Fits: 15-21 WRX/STI
Only 18 leftRegular price $1,706.00Sale price $1,706.00 Regular priceUnit price per$2,480.80 -
Company23 Dual AVCS Exhaust Cam Sprocket Tool
Fits: 08-21 STI
Regular price $51.00Sale price $51.00 Regular priceUnit price per$51.00
![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)
![Perrin [08-21 STI] Top Mount Intercooler Black | PSP-ITR-302BK](http://jdmuscleusa.com/cdn/shop/products/9f8361e7abd0588b383bc267ccb73ca6.jpg?v=1737769259&width=220)
![Perrin [08-21 STI] Top Mount Intercooler Black | PSP-ITR-302BK](http://jdmuscleusa.com/cdn/shop/products/abd6cdc1de7714314dfa4182b88b9d6f.jpg?v=1737769259&width=220)
![Perrin [18-21 STI] Cold Air Intake - Red](http://jdmuscleusa.com/cdn/shop/files/e9edcae1eb79d0a927baa1de2116feb9.jpg?v=1760370974&width=220)
![Perrin [18-21 STI] Cold Air Intake - Red](http://jdmuscleusa.com/cdn/shop/files/ffd45cdf1196a35b62cd21c085b3710c.jpg?v=1760370974&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI] TGV to Engine Gasket Pair | 032001](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-tumbler-to-engine-gaskets-for-subaru-gasket-032001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-032001.jpg?v=1614517838&width=220)
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall Burnt Tips | RO-TTVA-S](http://jdmuscleusa.com/cdn/shop/files/remark-stainless-steel-axle-back-w-single-wall-burnt-tips-2015-2021-wrx-2015-2021-sti-ro-ttva-s-134440_626x418_254219c0-e39d-4ec0-a0f7-60bc3b1d2ddf.jpg?v=1745512174&width=220)
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall Burnt Tips | RO-TTVA-S](http://jdmuscleusa.com/cdn/shop/files/remark-stainless-steel-axle-back-w-single-wall-burnt-tips-2015-2021-wrx-2015-2021-sti-ro-ttva-s-944538_626x501_56c78d8a-b13a-4acb-b7e6-54c8d0b67ead.jpg?v=1745512174&width=220)
