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 $2.50 offRadium Engineering Fuel Surge Tank Mtg Bracket Angled Mount - Universal
Regular price $47.45Sale price $47.45 Regular priceUnit price per$49.95 -
Up to $7.25 off
In StockRadium Engineering High Flow Fuel Filter Kit w/ 10 Micron Stainless Filter - Universal
Regular price $137.70Sale price $137.70 Regular priceUnit price per$144.95 -
Up to $6 offRadium Engineering Fuel Rail In Line Pulse Damper 6AN - Universal
Regular price $113.95Sale price $113.95 Regular priceUnit price per$119.95 -
Up to $12 off
In StockTomei Fuel Pressure Regulator Type-S - Universal
Only 5 leftRegular price $108.00Sale price $108.00 Regular priceUnit price per$120.00 -
In StockAeromotive 340 Series Stealth In-Tank E85 Fuel Pump - Center Inlet - Universal
Only 18 leftRegular price $162.50Sale price $162.50 Regular priceUnit price per$162.50 -
In StockAeromotive A1000 Fuel Pump - Universal
Only 7 leftRegular price $549.02Sale price $549.02 Regular priceUnit price per$549.02 -
In StockDeatschwerks Top Feed 565cc Injectors
Fits: 02-14 WRX, 07-21 STI, 07-12 LGT, 07-09 OBXT
Only 8 leftRegular price $379.00Sale price $379.00 Regular priceUnit price per$379.00 -
In StockDeatschWerks 65c Fuel Pump w/ Install Kit | dw9-652-1008
Fits: 08-14 WRX, 08-19 STI, 05-09 LGT/OBXT, 04-06 GTO
Only 3 leftRegular price $159.00Sale price $159.00 Regular priceUnit price per$159.00 -
In StockRemark Stainless Steel Axle Back w/ Double Wall Polished Tips | RO-TSVA-D
Fits: 15-21 WRX/STI
Regular price $655.00Sale price $655.00 Regular priceUnit price per$655.00 -
Killer B Performance Hardened Uppipe Studs WRX/STI | All Turbo Models | STS
Regular price $32.00Sale price $32.00 Regular priceUnit price per$32.00 -
Up to $383.85 offMXP Comp RS Catback Exhaust w/ Quad Exit Stainless Steel Tips | MXCRVA
Fits: 15-21 WRX/STI
Regular price $1,117.00Sale price $1,117.00 Regular priceUnit price per$1,500.85 -
In StockBrian Crower Exhaust Valves WRX 2002-2014 / STI 2004-2019
Only 7 leftRegular price From $147.81Sale price From $147.81 Regular priceUnit price per$0.00 -
![Torque Solution [08-21 WRX/STI, 05-09 LGT, 13-21 BRZ] 12MM Exhaust Mount Standard Length | TS-SU-012](//jdmuscleusa.com/cdn/shop/products/torque-solution-12mm-exhaust-mount-wrx-sti-2008-2014-legacy-gt-2005-2009-exhaust-hangers-torque-solution-tqsts-su-012.jpg?v=1614519030&width=220)
Torque Solution 12MM Exhaust Mount Standard Length | TS-SU-012
Fits: 08-21 WRX/STI, 05-09 LGT, 13-21 BRZ
Regular price $16.00Sale price $16.00 Regular priceUnit price per$16.00 -
Up to $824.40 offInvidia Q300 Cat Back Exhaust w/ Single Wall Titanium Tips | HS15STIG2T
Fits: 15-21 WRX/STI
Regular price $1,816.00Sale price $1,816.00 Regular priceUnit price per$2,640.40 -
![Invidia [15-21 WRX/STI / 15-16 FXT] N1 Dual Cat Back Exhaust | HS15STIGTP](//jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-stainless-steel-tips-cat-back-exhaust-subaru-forester-xt-2014-2017-hs15stigtp-cat-back-exhaust-system-invidia-invhs15stigtp.jpg?v=1614517108&width=220)
![Invidia [15-21 WRX/STI / 15-16 FXT] N1 Dual Cat Back Exhaust | HS15STIGTP](//jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-stainless-steel-tips-cat-back-exhaust-subaru-forester-xt-2014-2017-hs15stigtp-cat-back-exhaust-system-invidia-invhs15stigtp-2.jpg?v=1614675307&width=220)
Up to $566 off
In StockInvidia N1 Dual Cat Back Exhaust | HS15STIGTP
Fits: 15-21 WRX/STI / 15-16 FXT
Only 5 leftRegular price $1,247.00Sale price $1,247.00 Regular priceUnit price per$1,813.00 -
Up to $495.60 off
In StockInvidia N1 Cat Back Exhaust Polished Tip | HS15SW4GTP
Fits: 15-21 WRX/STI
Only 4 leftRegular price $1,092.00Sale price $1,092.00 Regular priceUnit price per$1,587.60
![Torque Solution [08-21 WRX/STI, 05-09 LGT, 13-21 BRZ] 12MM Exhaust Mount Standard Length | TS-SU-012](http://jdmuscleusa.com/cdn/shop/products/torque-solution-12mm-exhaust-mount-wrx-sti-2008-2014-legacy-gt-2005-2009-exhaust-hangers-torque-solution-tqsts-su-012.jpg?v=1614519030&width=220)
![Invidia [15-21 WRX/STI / 15-16 FXT] N1 Dual Cat Back Exhaust | HS15STIGTP](http://jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-stainless-steel-tips-cat-back-exhaust-subaru-forester-xt-2014-2017-hs15stigtp-cat-back-exhaust-system-invidia-invhs15stigtp.jpg?v=1614517108&width=220)
![Invidia [15-21 WRX/STI / 15-16 FXT] N1 Dual Cat Back Exhaust | HS15STIGTP](http://jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-stainless-steel-tips-cat-back-exhaust-subaru-forester-xt-2014-2017-hs15stigtp-cat-back-exhaust-system-invidia-invhs15stigtp-2.jpg?v=1614675307&width=220)
