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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ETS 08-21 STI Top Mount Intercooler Silver Core | 200-20-IC-037
Regular price $695.00Sale price $695.00 Regular priceUnit price per$695.00 -
HKS Premium Suction Kit WRX 2009-2014 / STI 2009-2020 | 70018-AF010
Regular price $522.00Sale price $522.00 Regular priceUnit price per$522.00 -
In StockHKS 3 Layer Dry 150mm Green Replacement Filter Element - Universal | 70001-AK021
Regular price $25.00Sale price $25.00 Regular priceUnit price per$25.00 -
Up to $5.12 offAEM Coolant Temperature Sensor Kit w/3/8 inch Female Weld-In Aluminum Bung - Universal | 30-2011
Regular price $46.07Sale price $46.07 Regular priceUnit price per$51.19 -
Up to $7 off
In StockAEM Water/Methanol Injection Filter - Universal | 30-3003
Only 6 leftRegular price $51.95Sale price $51.95 Regular priceUnit price per$58.95 -
Up to $67 off
In StockAEM V2 Water/Methanol Injection Kit - NO TANK | Internal Map - Universal | 30-3302
Only 5 leftRegular price $531.95Sale price $531.95 Regular priceUnit price per$598.95 -
Up to $75 off
In StockAEM V2 1 Gallon Water/Methanol Injection Kit - Universal | 30-3300
Only 9 leftRegular price $599.95Sale price $599.95 Regular priceUnit price per$674.95 -
In StockJE Pistons Ring Sets 1.2 / 1.2 / 2.5 Subaru EJ257 Block w/EJ20 Head | JG4904-3937
Only 2 leftRegular price $183.99Sale price $183.99 Regular priceUnit price per$183.99 -
![Perrin [16-17 STI] Cold Air Intake Black | PSP-INT-323BK](//jdmuscleusa.com/cdn/shop/files/PSP-INT-323BK_01.jpg?v=1759363288&width=220)
![Perrin [16-17 STI] Cold Air Intake Black | PSP-INT-323BK](//jdmuscleusa.com/cdn/shop/files/PSP-INT-323BK_02.jpg?v=1758562511&width=220)
Up to $102.50 offPerrin Cold Air Intake Black | PSP-INT-323BK
Fits: 16-17 STI
Regular price $307.50Sale price $307.50 Regular priceUnit price per$410.00 -
Ferrea Valve Locks | Subaru EJ25 STi 04+ K10074
Regular price $106.56Sale price $106.56 Regular priceUnit price per$106.56 -
aFe Pro Dry S Cleaning Kits - Universal | 90-59999
Regular price $22.33Sale price $22.33 Regular priceUnit price per$22.33 -
Process West 15-21 STI Cold Air Intake - Black | PWCAI07
Regular price $403.00Sale price $403.00 Regular priceUnit price per$403.00 -
NRG Fender Washer Kit FW-800 Rose Gold 8mm - Universal | FW-800RG
Regular price $33.00Sale price $33.00 Regular priceUnit price per$33.00 -
In StockNRG Fender Washer Kit FW-100 Black - Universal | FW-100BK
Only 8 leftRegular price $28.60Sale price $28.60 Regular priceUnit price per$28.60 -
NRG Fender Washer Kit FW-300SS - Universal | FW-300SS
Regular price $44.00Sale price $44.00 Regular priceUnit price per$44.00 -
NRG Fender Washer Kit FW-300TT - Universal | FW-300TT
Regular price $44.00Sale price $44.00 Regular priceUnit price per$44.00
![Perrin [16-17 STI] Cold Air Intake Black | PSP-INT-323BK](http://jdmuscleusa.com/cdn/shop/files/PSP-INT-323BK_01.jpg?v=1759363288&width=220)
![Perrin [16-17 STI] Cold Air Intake Black | PSP-INT-323BK](http://jdmuscleusa.com/cdn/shop/files/PSP-INT-323BK_02.jpg?v=1758562511&width=220)
