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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Up to $743.80 off
In StockInvidia Full Titanium Cat Back Exhaust | HS15SW4TRG
Fits: 15-21 WRX/STI
Only 1 leftRegular price $1,359.00Sale price $1,359.00 Regular priceUnit price per$2,102.80 -
Up to $614 offInvidia N1 Titanium Cat Back Exhaust WRX/STI 15-21 | HS15STIDTG
Regular price $1,352.00Sale price $1,352.00 Regular priceUnit price per$1,966.00 -
![Invidia [15-21 WRX/STI] Gemini R400 Full Titanium Catback Exhaust](//jdmuscleusa.com/cdn/shop/files/DSC_1114_1080x1080_93d6a43d-8f45-48fe-ad4f-60a962205e08.jpg?v=1784053861&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Full Titanium Catback Exhaust](//jdmuscleusa.com/cdn/shop/files/DSC_1120_1080x1080_4d9a4dd8-b6df-4b8c-b8a9-1c94650245ba.jpg?v=1784053879&width=220)
Up to $871 offInvidia Gemini R400 Full Titanium Catback Exhaust
Fits: 15-21 WRX/STI
Regular price $1,917.00Sale price $1,917.00 Regular priceUnit price per$2,788.00 -
Up to $571.73 off
In StockInvidia 08-14 WRX / 05-21 STI Equal Length Race Header | HS05SW1HDR
Only 6 leftRegular price $1,259.00Sale price $1,259.00 Regular priceUnit price per$1,830.73 -
Remark Cat Back Exhaust Titanium Stainless Single Wall Tip w/Resonated Mid Pipe- Discontinuing NO RETURNS
Fits: 15-21 WRX/STI
Regular price $1,170.00Sale price $1,170.00 Regular priceUnit price per$1,170.00 -
Remark Sports Touring Non Resonated Cat Back w/ Polished Stainless Tips | RK-C4076S-01
Fits: 15-21 WRX/STI
Regular price $1,395.00Sale price $1,395.00 Regular priceUnit price per$1,395.00 -
Remark Sports Touring Resonated Cat Back w/ Polished Stainless Tips | RK-C4076S-01C
Fits: 15-21 WRX/STI
Regular price $1,495.00Sale price $1,495.00 Regular priceUnit price per$1,495.00 -
Remark Sports Touring Non Resonated Cat Back w/ Burnt Stainless Tips | RK-C4076S-01T
Fits: 15-21 WRX/STI
Regular price $1,495.00Sale price $1,495.00 Regular priceUnit price per$1,495.00 -
Remark SPT Style Axle Back w/ Double Wall Polished Tips | RO-TSSP-D
Fits: 15-21 WRX/STI
Regular price $495.00Sale price $495.00 Regular priceUnit price per$495.00 -
Up to $2.22 offSupertech Subaru EJ20/EJ25 Manganese Bronze Exhaust Valve Guide 6mm Stem OD 11.08mm
Regular price $8.89Sale price $8.89 Regular priceUnit price per$11.11 -
Up to $13.75 offRevel 08-14 WRX / 08-21 STI GT Dry Carbon Engine Belt Cover | 1TR4GT0AS12
Regular price $261.25Sale price $261.25 Regular priceUnit price per$275.00 -
In StockHKS Super Turbo Twin Tail Titanium Tip Catback Exhaust
Fits: 15-21 WRX/STI
Only 2 leftRegular price $6,300.00Sale price $6,300.00 Regular priceUnit price per$6,300.00 -
In StockHKS Hi-Power Catback Exhaust | 31006-BF001
Fits: 15-21 WRX/STI
Regular price $1,900.00Sale price $1,900.00 Regular priceUnit price per$1,900.00 -
Up to $8.76 offGSC Power-Division 02-14 WRX / 04-21 STI Exhaust Valve Guides OEM Style | 3027-8
Regular price $49.65Sale price $49.65 Regular priceUnit price per$58.41 -
Up to $8.76 offGSC Power-Division Exhaust Valve Guides Stopper Style WRX 2002-2014 / STI 2004-2020 Subaru Turbo Models
Regular price $49.65Sale price $49.65 Regular priceUnit price per$58.41 -
Up to $7 off
In StockVibrant SS Accuseal Exhaust Seal Clamp - Universal
Regular price From $15.79Sale price From $15.79 Regular priceUnit price per$20.99
![Invidia [15-21 WRX/STI] Gemini R400 Full Titanium Catback Exhaust](http://jdmuscleusa.com/cdn/shop/files/DSC_1114_1080x1080_93d6a43d-8f45-48fe-ad4f-60a962205e08.jpg?v=1784053861&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Full Titanium Catback Exhaust](http://jdmuscleusa.com/cdn/shop/files/DSC_1120_1080x1080_4d9a4dd8-b6df-4b8c-b8a9-1c94650245ba.jpg?v=1784053879&width=220)
