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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![Aeromotive Fuel Pressure Regulator [Universal] | 13129](//jdmuscleusa.com/cdn/shop/products/aeromotive-fuel-pressure-regulator-13129-universal-fuel-pressure-regulators-aeromotive-aer13129.jpg?v=1614524090&width=220)
In StockAeromotive Fuel Pressure Regulator | 13129
Fits: Universal
Regular price $187.74Sale price $187.74 Regular priceUnit price per$187.74 -
Up to $83.95 off
In StockAWE Touring Edition Cat Back Exhaust Chrome Silver Quad Tips | 102mm | 3015-42104
Fits: 11-14 WRX, 11-21 STI Sedan
Only 4 leftRegular price $1,595.00Sale price $1,595.00 Regular priceUnit price per$1,678.95 -
Up to $83.95 off
In StockAWE Touring Edition Cat Back Exhaust Diamond Black Quad Tips | 102mm | 3015-43108
Fits: 11-14 WRX, 11-21 STI Sedan
Only 1 leftRegular price $1,595.00Sale price $1,595.00 Regular priceUnit price per$1,678.95 -
Up to $8.21 off
In StockTorque Solution Exhaust Mount Kit WRX/STI 2008-2019 / Legacy GT 2005-2012
Only 7 leftRegular price $54.00Sale price $54.00 Regular priceUnit price per$62.21 -
![Invidia [15-21 WRX/STI] N1 Cat Back Exhaust Titanium Tip | HS15SW4GTT](//jdmuscleusa.com/cdn/shop/products/invidia-n1-resonated-cat-back-exhaust-single-titanium-tip-subaru-wrx-sti-2015-2019-hs15sw4gtt-cat-back-exhaust-system-invidia-invhs15sw4gtt.jpg?v=1614516953&width=220)
Up to $495.60 offInvidia N1 Cat Back Exhaust Titanium Tip | HS15SW4GTT
Fits: 15-21 WRX/STI
Regular price $1,092.00Sale price $1,092.00 Regular priceUnit price per$1,587.60 -
Up to $824.40 off
In StockInvidia Q300 Cat Back Exhaust w/ Double Wall Titanium Tips
Fits: 15-21 WRX/STI
Only 9 leftRegular price $1,816.00Sale price $1,816.00 Regular priceUnit price per$2,640.40 -
Up to $3 off
In StockVibrant 3-Bolt High Temperature Exhaust Gasket - Universal
Regular price From $5.99Sale price From $5.99 Regular priceUnit price per$7.99 -
Process West Radiator Cover Black Factory Intake | PWED03B
Fits: 15-21 WRX/STI
Regular price $78.65Sale price $78.65 Regular priceUnit price per$78.65 -
Up to $3.40 off
In StockCusco High Pressure Radiator Cap - Universal
Only 5 leftRegular price $30.60Sale price $30.60 Regular priceUnit price per$34.00 -
Up to $565.30 offAEM Infinity 506 Stand-Alone Programmable Engine Management System - Universal | 30-7106
Regular price $1,506.92Sale price $1,506.92 Regular priceUnit price per$2,072.22 -
Up to $511.42 off
In StockTurboXS 15-21 Subaru STI Front Mount Intercooler Wrinkle Black | STI15-FMIC-BLK
Only 4 leftRegular price $1,445.00Sale price $1,445.00 Regular priceUnit price per$1,956.42 -
GrimmSpeed Top Mount Intercooler Thermal - Black
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Regular price $1,065.00Sale price $1,065.00 Regular priceUnit price per$1,065.00 -
GrimmSpeed Hood Scoop Splitter
Fits: 15-21 STI
Regular price $306.00Sale price $306.00 Regular priceUnit price per$306.00 -
Up to $4.05 off
In StockMishimoto Aluminum Radiator Stay WRX/STI 15-21 | MMRS-WRX-15
Only 5 leftRegular price From $40.95Sale price From $40.95 Regular priceUnit price per$45.00 -
Up to $62.05 off
In StockMishimoto 15-21 STI Thermostatic Oil Cooler Kit Black | MMOC-STI-15TBK
Only 2 leftRegular price $624.95Sale price $624.95 Regular priceUnit price per$687.00 -
Up to $62.05 off
In StockMishimoto Thermostatic Oil Cooler Kit
Fits: 15-21 STI
Only 1 leftRegular price $624.95Sale price $624.95 Regular priceUnit price per$687.00
![Aeromotive Fuel Pressure Regulator [Universal] | 13129](http://jdmuscleusa.com/cdn/shop/products/aeromotive-fuel-pressure-regulator-13129-universal-fuel-pressure-regulators-aeromotive-aer13129.jpg?v=1614524090&width=220)
![Invidia [15-21 WRX/STI] N1 Cat Back Exhaust Titanium Tip | HS15SW4GTT](http://jdmuscleusa.com/cdn/shop/products/invidia-n1-resonated-cat-back-exhaust-single-titanium-tip-subaru-wrx-sti-2015-2019-hs15sw4gtt-cat-back-exhaust-system-invidia-invhs15sw4gtt.jpg?v=1614516953&width=220)
