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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In StockGrimmspeed 15-21 WRX /STI Fender Shroud Kit Hi-Vis Neon Yellow | 096057
Only 3 leftRegular price $124.00Sale price $124.00 Regular priceUnit price per$124.00 -
Grimmspeed 08-21 STI Electronic Boost Control Solenoid Cover Hi-Vis Neon Yellow | 112000.3
Regular price $88.00Sale price $88.00 Regular priceUnit price per$88.00 -
Up to $110 offMXP Comp RS Catback Exhaust w/ Dual Exit Tips | MXCRVAS
Fits: 15-21 WRX/STI
Regular price $700.00Sale price $700.00 Regular priceUnit price per$810.00 -
In StockHKS 2 Layer Dry 200mm Red Replacement Filter Element - Universal | 70001-AK032
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
Up to $5.08 off
In StockAEM Universal 12 Position Trim Pot | 30-2056
Only 13 leftRegular price $40.61Sale price $40.61 Regular priceUnit price per$45.69 -
In StockGrimmspeed 08-21 WRX/STI Lightweight Battery Mount Kit Black | 121028
Only 10 leftRegular price $165.00Sale price $165.00 Regular priceUnit price per$165.00 -
Up to $2.10 off
In StockAEM 08-14 WRX / 08-18 STI Air Filter | 28-20304
Only 18 leftRegular price $50.39Sale price $50.39 Regular priceUnit price per$52.49 -
Up to $91 off
In StockAEM V2 5 Gallon Water/Methanol Injection Kit | Internal Map - Universal | 30-3301
Only 7 leftRegular price $727.95Sale price $727.95 Regular priceUnit price per$818.95 -
aFe Takeda Dry Filter Cleaner - Universal
Regular price $23.45Sale price $23.45 Regular priceUnit price per$23.45 -
In StockaFe Filter Cleaning Kit Power Restore Kit Squeeze Blue - Universal | 90-50501
Regular price $21.00Sale price $21.00 Regular priceUnit price per$21.00 -
Up to $8.66 off
In StockManley Sport Compact 99.5mm Bore 1.2mm x 1.2mm x 2.0mm Standard Ring Set 02+ WRX/STI EJ25 | 46995-4
Only 3 leftRegular price $164.51Sale price $164.51 Regular priceUnit price per$173.17 -
JE Pistons 100.0mm Ring Sets - Universal | JC4404-3938
Regular price $72.25Sale price $72.25 Regular priceUnit price per$0.00 -
In StockGates 170 Degree Thermostat WRX 2002-2014 / STI 2004-2019 | 34012
Only 3 leftRegular price $28.00Sale price $28.00 Regular priceUnit price per$28.00 -
In StockARP Ultra Torque Assembly Lube 10oz - Universal | 100-9910
Only 3 leftRegular price $27.00Sale price $27.00 Regular priceUnit price per$27.00 -
aFe Filter Cleaning Kit Power Restore Kit 32 oz. Gold - Universal
Regular price $35.99Sale price $35.99 Regular priceUnit price per$35.99 -
Up to $4.43 offTorque Solution Stainless Steel Denso MAF Flange | For 3in Piping Subaru STI 2008-2019
Regular price $40.00Sale price $40.00 Regular priceUnit price per$44.43
