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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Up to $994.01 offAEM Infinity-8 Stand-Alone Programmable Engine Management System EMS - Universal | 30-7101
Regular price $2,556.02Sale price $2,556.02 Regular priceUnit price per$3,550.03 -
In StockCSF Universal Dual-Pass Oil Cooler | RS Style - M22 x 1.5 - 24in L x 5.75in H x 2.16in W
Only 4 leftRegular price $619.00Sale price $619.00 Regular priceUnit price per$619.00 -
In StockCSF Universal Dual-Pass Internal/External Oil Cooler - 22.0in L x 5.0in H x 2.25in W
Only 9 leftRegular price $379.00Sale price $379.00 Regular priceUnit price per$379.00 -
Up to $54 off
In StockCSF Universal Triple Pass Dual Core Radiator w/AN Fittings
Only 11 leftRegular price $525.00Sale price $525.00 Regular priceUnit price per$579.00 -
Up to $44 off
In StockCSF Universal Half Radiator w/-16AN & Slip-On Fittings/12in SPAL Fan & Shroud
Only 14 leftRegular price $685.00Sale price $685.00 Regular priceUnit price per$729.00 -
Grimmspeed Front Mount Intercooler Kit Silver Core w/ Black Piping
Fits: 15-21 STI
Regular price $2,174.00Sale price $2,174.00 Regular priceUnit price per$2,174.00 -
Grimmspeed Front Mount Intercooler Kit Black Core w/ Black Piping
Fits: 15-21 STI
Regular price $2,319.00Sale price $2,319.00 Regular priceUnit price per$2,319.00 -
Up to $1.50 offRadium Engineering Radiator Cap Type-A 1.1 Bar - Universal
Regular price $28.45Sale price $28.45 Regular priceUnit price per$29.95 -
Up to $99 off
In StockVibrant Air to Air Intercooler with End Tanks 22in Wx9in Hx3.25in thick 2.5in in/out - Universal
Only 1 leftRegular price $386.99Sale price $386.99 Regular priceUnit price per$485.99 -
Up to $72 off
In StockVibrant Air to Air Intercooler with End Tanks 18in Wx6.5in Hx3.25in thick 2.5in in/out - Universal
Only 3 leftRegular price $297.99Sale price $297.99 Regular priceUnit price per$369.99 -
![CSF Racing [08-14 WRX / 08-21] STI Aluminum Radiator with Oil Cooler | 7042O](//jdmuscleusa.com/cdn/shop/products/csf-racing-radiator-w-built-in-oil-cooler-subaru-wrx-2008-2014-sti-2008-2020-radiators-csf-7042o.jpg?v=1614536669&width=220)
![CSF Racing [08-14 WRX / 08-21] STI Aluminum Radiator with Oil Cooler | 7042O](//jdmuscleusa.com/cdn/shop/files/csf-racing-aluminum-radiator-with-oil-cooler-2008-2014-wrx-2008-2021-sti-7042o-331229_556x556_129a2aa8-0f86-4322-a11f-984a89256001.jpg?v=1688416473&width=220)
Up to $85 offCSF Racing STI Aluminum Radiator with Oil Cooler | 7042O
Fits: 08-14 WRX / 08-21
Regular price $664.00Sale price $664.00 Regular priceUnit price per$749.00 -
Process West 15-20 STI Front Mount Intercooler Kit Black | PWFMIC08B
Regular price $1,662.00Sale price $1,662.00 Regular priceUnit price per$1,662.00 -
Up to $352.75 off
In StockPerrin Front Mount Intercooler | Silver Core and Beam Only WRX/STI 15-2020 | PSP-ITR-437-1SL
Only 2 leftRegular price $1,058.25Sale price $1,058.25 Regular priceUnit price per$1,411.00 -
Up to $8.66 off
In StockTorque Solution 08-14 WRX / 08-21 STI / 05-09 LGT Radiator Stay Black | TS-SU-205B
Only 3 leftRegular price $58.00Sale price $58.00 Regular priceUnit price per$66.66 -
Torque Solution Black Top Mount Intercooler WRX 2002-2007 / STI 2004-2019
Regular price $644.44Sale price $644.44 Regular priceUnit price per$644.44 -
Up to $8.21 off
In StockTurbo XS Billet Aluminum Radiator Stay Black WRX/STI 15-2019 | W15-RADSTAY-BLK
Only 7 leftRegular price $44.00Sale price $44.00 Regular priceUnit price per$52.21
![CSF Racing [08-14 WRX / 08-21] STI Aluminum Radiator with Oil Cooler | 7042O](http://jdmuscleusa.com/cdn/shop/products/csf-racing-radiator-w-built-in-oil-cooler-subaru-wrx-2008-2014-sti-2008-2020-radiators-csf-7042o.jpg?v=1614536669&width=220)
![CSF Racing [08-14 WRX / 08-21] STI Aluminum Radiator with Oil Cooler | 7042O](http://jdmuscleusa.com/cdn/shop/files/csf-racing-aluminum-radiator-with-oil-cooler-2008-2014-wrx-2008-2021-sti-7042o-331229_556x556_129a2aa8-0f86-4322-a11f-984a89256001.jpg?v=1688416473&width=220)
