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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GSC P-D Ovate Beehive Valve Spring - Universal
Regular price $12.44Sale price $12.44 Regular priceUnit price per$0.00 -
Up to $8.76 offGSC Power-Division Intake Valve Guides Stopper Style 2002-2014 WRX / 2004-2020 STI Subaru Turbo Models
Regular price $49.65Sale price $49.65 Regular priceUnit price per$58.41 -
GSC Power-Division 08-21 STI S1 Billet Camshaft Set | 7026S1
Regular price $1,058.68Sale price $1,058.68 Regular priceUnit price per$0.00 -
Up to $0.75 off
In StockRadium Engineering 9/16-18 O-Ring Port Plug - Universal
Only 14 leftRegular price $14.20Sale price $14.20 Regular priceUnit price per$14.95 -
Up to $0.25 off
In StockRadium Engineering O-Ring 5-Pack 6AN Viton - Universal
Only 4 leftRegular price $4.70Sale price $4.70 Regular priceUnit price per$4.95 -
Up to $0.25 offRadium Engineering O-Ring 5-Pack 10AN Viton - Universal
Regular price $4.70Sale price $4.70 Regular priceUnit price per$4.95 -
Up to $0.25 off
In StockRadium Engineering O-Ring 5-Pack 8AN Viton - Universal
Only 4 leftRegular price $4.70Sale price $4.70 Regular priceUnit price per$4.95 -
Up to $0.70 off
In StockRadium Engineering O-Ring Multi Pack 6AN/8AN/10AN - Universal
Only 5 leftRegular price $13.25Sale price $13.25 Regular priceUnit price per$13.95 -
King Engine Main Bearings WRX/STI EJ20/EJ22/EJ25 | For Thrust in #5 Position 2002-2020
Regular price From $93.00Sale price From $93.00 Regular priceUnit price per$93.00 -
Up to $4.49 off
In StockVibrant Turbo Gasket for T3/GT30R Inlet Flange - Universal
Only 10 leftRegular price $12.50Sale price $12.50 Regular priceUnit price per$16.99 -
Company23 Timing Belt Guide Kit 2002-2014 WRX / 2004-2020 STI Subaru Turbo Models
Regular price $66.00Sale price $66.00 Regular priceUnit price per$66.00 -
Up to $22.25 offCometic Street Pro Block 101mm Bore Engine Full Gasket Kit Subaru EJ205 Heads w/ EJ257
Regular price $295.54Sale price $295.54 Regular priceUnit price per$317.79 -
Up to $29.29 off
In StockCometic Street Pro 101mm Bore Complete Gasket Kit WRX EJ255 DOHC 2006-2007 | PRO2045C
Only 7 leftRegular price $389.15Sale price $389.15 Regular priceUnit price per$418.44 -
Cometic 102mm Bore/ .040in Head Gasket WRX/STI EJ25 2002-2020
Regular price $45.21Sale price $45.21 Regular priceUnit price per$0.00 -
Up to $8.50 off
In StockCometic 101mm Bore MLX Head Gasket | Single Subaru EJ25 WRX/STI
Only 3 leftRegular price $76.63Sale price $76.63 Regular priceUnit price per$85.13 -
Carrillo Pro-A 3/8 WMC Bolt Connecting Rods WRX/STI EJ18/EJ20/EJ257 2002-2020
Regular price $862.05Sale price $862.05 Regular priceUnit price per$0.00
