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 $520 off
In StockInvidia Q300 Single Cat Back Exhaust | HS15SW4G3S
Fits: 15-21 WRX/STI
Only 2 leftRegular price $1,146.00Sale price $1,146.00 Regular priceUnit price per$1,666.00 -
Up to $623 offInvidia Big Piping Header WRX/STI / Legacy GT 2002-2019 Subaru EJ Turbo Models | HS05SW1HDP
Regular price $2,163.00Sale price $2,163.00 Regular priceUnit price per$2,786.00 -
In StockRemark Boso Axle Back Exhaust with Burnt Stainless Single Wall Tip WRX 15-21 / WRX STI 15-21 | RO-TTVA-SL
Only 3 leftRegular price $795.00Sale price $795.00 Regular priceUnit price per$795.00 -
Remark Sports Touring Resonated Cat Back w/ Burnt Stainless Tips | RK-C4076S-01TC
Fits: 15-21 WRX/STI
Regular price $1,595.00Sale price $1,595.00 Regular priceUnit price per$1,595.00 -
Injen Cat Back Exhaust w/ Quad Titanium Tips | SES1206TT
Fits: 15-21 WRX/STI
Regular price $1,461.48Sale price $1,461.48 Regular priceUnit price per$1,461.48 -
In StockHKS Super Turbo Dual Stainless Steel Tip Catback Exhaust | 31029-AF011
Fits: 15-21 WRX/STI
Only 1 leftRegular price $2,200.00Sale price $2,200.00 Regular priceUnit price per$2,200.00 -
Greddy GPP RS-Race Cat Back Exhaust WRX/STI 15-21 | 10168408
Regular price $570.00Sale price $570.00 Regular priceUnit price per$550.00 -
Process West Radiator Cover Black Non Factory Intake | PRW-PWED04B
Fits: 15-21 WRX/STI
Regular price $78.65Sale price $78.65 Regular priceUnit price per$78.65 -
Up to $38.05 off
In StockMishimoto R Line Intercooler Black - Universal
Only 2 leftRegular price $376.95Sale price $376.95 Regular priceUnit price per$415.00 -
Up to $35.05 off
In StockMishimoto M Line Intercooler Eat Sleep Race Edition G/G - Universal
Only 5 leftRegular price $351.95Sale price $351.95 Regular priceUnit price per$387.00 -
Up to $34.05 off
In StockMishimoto Aluminum Radiator 25in x 16in x 3in - Universal
Only 5 leftRegular price $339.95Sale price $339.95 Regular priceUnit price per$374.00 -
Killer B Relocated Oil Fill Tube
Fits: 02-05 WRX/STI EJ20/EJ25
Regular price $167.93Sale price $167.93 Regular priceUnit price per$167.00 -
Up to $27 off
In StockCusco Intercooler Protection Net
Fits: 15-21 STI
Only 7 leftRegular price $243.00Sale price $243.00 Regular priceUnit price per$270.00 -
Up to $10 off
In StockCSF Universal Drag Race / Tuck Radiator w/9in Spal Fan - 10.5in H x 10in L x 3.6in W
Only 8 leftRegular price $569.00Sale price $569.00 Regular priceUnit price per$579.00 -
Up to $1.50 off
In StockRadium Engineering Radiator Cap Type-A 1.5 Bar - Universal
Only 17 leftRegular price $28.45Sale price $28.45 Regular priceUnit price per$29.95 -
Process West 15-21 STI Front Mount Intercooler Kit | PWFMIC08
Regular price $1,662.00Sale price $1,662.00 Regular priceUnit price per$1,662.00
