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 StockCOBB SF Intake Replacement Intake Filter | 712101 - For 712100,715100,724100
Fits: Subaru Models
Regular price $73.00Sale price $73.00 Regular priceUnit price per$73.00 -
Up to $154 off
In StockBLOX Racing Muffler Delete Kit - Black Tip
Fits: 15-21 WRX/STI
Only 2 leftRegular price $314.00Sale price $314.00 Regular priceUnit price per$468.00 -
HKS Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit | 71008-KF013VB
Fits: 08-21 STI
Regular price $382.80Sale price $382.80 Regular priceUnit price per$382.80 -
In StockHKS 1.1 Bar Limited Edition Radiator Cap
Fits: 02-26 WRX/STI, 13-21 BRZ/FRS/86
Regular price $41.00Sale price $41.00 Regular priceUnit price per$41.00 -
Up to $5.36 off
In StockKoyo 13mm Coolant Reservoir Adapter - For Part# VH091662 | PI-2183
Fits: 08-21 WRX/STI, 05-09 LGT
Only 4 leftRegular price $16.00Sale price $16.00 Regular priceUnit price per$21.36 -
Up to $938 off
In StockInvidia Gemini R400 Signature Series Black Tip Quad Tip Exhaust
Fits: 15-21 WRX/STI
Only 13 leftRegular price $1,736.00Sale price $1,736.00 Regular priceUnit price per$2,674.00 -
Up to $6.15 offPerrin Throttle Body Hose Red
Fits: 02-07 WRX, 04-21 STI
Regular price $34.85Sale price $34.85 Regular priceUnit price per$41.00 -
Up to $5.36 off
In StockKoyo 8mm Coolant Reservoir Adapter-For Part# VH091662
Fits: 08-21 WRX/STI
Only 6 leftRegular price $16.00Sale price $16.00 Regular priceUnit price per$21.36 -
Up to $14 offCompressive Tuning AirShields
Fits: 22-25 WRX, 15-21 STI, 19+ Ascent /Outback/Legacy
Regular price From $121.00Sale price From $121.00 Regular priceUnit price per$135.00 -
Up to $54 offPLM Power Driven Up Pipe | PLM-SUB-UP-PIPE-IWG
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT
Regular price $195.00Sale price $195.00 Regular priceUnit price per$249.00 -
Up to $110 offPLM 02-14 WRX/ 04-21 STI Power Driven EWG 2-Bolt Up Pipe with Dump Tube 38mm | Also fits Baja Turbo 2004-2006 / Forester XT 2004-2013 / Legacy GT 2005-2009 / Turbo 1991-1994 / Outback XT 2005-2009 | PLM-SUB-UP-PIPE-EWG-38MM
Regular price $339.00Sale price $339.00 Regular priceUnit price per$449.00 -
Up to $2.44 off
In StockPerrin 12MM Red Exhaust Hanger
Fits: 08-25 WRX/STI, 05-09 LGT, 13-21 BRZ
Regular price $13.81Sale price $13.81 Regular priceUnit price per$16.25 -
In StockRemark Stainless Steel Axle Back w/ Double Wall 4 Inch Burnt Tips
Fits: 15-21 WRX/STI
Only 2 leftRegular price $774.00Sale price $774.00 Regular priceUnit price per$774.00 -
Up to $33.05 off
In StockMishimoto Plug-N-Play Aluminum Fan Shroud Kit | MMFS-STI-08P
Fits: 08-15 WRX/STI
Only 4 leftRegular price $334.95Sale price $334.95 Regular priceUnit price per$368.00 -
In StockCOBB Redline Fuse Cover - Gloss Finish
Fits: 08-21 WRX/STI
Only 12 leftRegular price $207.00Sale price $207.00 Regular priceUnit price per$207.00 -
Up to $13.20 off
In StockPerrin Oil Fill Cap
Fits: 02-25 WRX, 04-21 STI, 13-25 BRZ/FRS/86
Regular price From $69.70Sale price From $69.70 Regular priceUnit price per$82.00