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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![Perrin [16 - 17 STI] Cold Air Intake - Hyper Pink | PSP - INT - 323HP - JDMuscleIntakesperPSP-INT-323HP](//jdmuscleusa.com/cdn/shop/files/perrin-16-17-sti-cold-air-intake-hyper-pink-psp-int-323hp-6245587.jpg?v=1770329378&width=220)
![Perrin [16 - 17 STI] Cold Air Intake - Hyper Pink | PSP - INT - 323HP - JDMuscleIntakesperPSP-INT-323HP](//jdmuscleusa.com/cdn/shop/files/perrin-16-17-sti-cold-air-intake-hyper-pink-psp-int-323hp-8770232.jpg?v=1770329378&width=220)
Up to $107.75 offPerrin Cold Air Intake - Hyper Pink | PSP-INT-323HP
Fits: 16-17 STI
Regular price $323.25Sale price $323.25 Regular priceUnit price per$431.00 -
GSC Power-Division 02-14 WRX / 04-21 STI Super Alloy Exhaust Valves 32mm | 15-8
Regular price $266.00Sale price $266.00 Regular priceUnit price per$266.00 -
Up to $71.50 offGSC Power-Division 08-21 STI S2 Billet Camshaft Set | 7026S2
Regular price $1,174.00Sale price $1,174.00 Regular priceUnit price per$1,245.50 -
Milltek Cat Back Exhaust 3in w/Cerakote Black Finished Tips WRX/STI 2015+ | SSXSB50
Regular price $2,113.26Sale price $2,113.26 Regular priceUnit price per$2,113.26 -
ETS 15-21 WRX / 15-18 STI Axle Back Exhaust Burnt Tips w/ Muffler | 200-30-EXH-004
Regular price $695.00Sale price $695.00 Regular priceUnit price per$695.00 -
Killer B Motorsport 02-14 WRX / 04-21 STI 4-1 Holy Header Exhaust Manifold w/ V Band Up-Pipe | HH4-1
Regular price $2,175.00Sale price $2,175.00 Regular priceUnit price per$2,175.00 -
In StockHKS 06-14 WRX / 04-21 STI / 05-09 LGT Stainless Steel Unequal Length Exhaust Manifold | 1419-RF001
Only 13 leftRegular price $1,470.00Sale price $1,470.00 Regular priceUnit price per$1,470.00 -
Up to $18.90 offPerrin Performance Afta MAF Hose Red WRX 2002-2014 / Legacy GT 2005-2009 / Outback XT 2005-2009 / STI 2004-21 | PSP-INT-355RD
Regular price $107.10Sale price $107.10 Regular priceUnit price per$126.00 -
Up to $72 off
In StockTomei 02-14 WRX / 04-21 STI Forged Connecting Rods | TA203A-SB01A
Only 5 leftRegular price $648.00Sale price $648.00 Regular priceUnit price per$720.00 -
HKS 02-14 WRX / 04-21 STI / 05-12 LGT / 04-13 FXT Fine Tune Timing Belt | 24999-AF001
Regular price $383.00Sale price $383.00 Regular priceUnit price per$383.00 -
Killer B Motorsport 4-1 Holy Header w/EGT Bung 2-Bolt Coated Subaru EJ Models | inc. 2002-2014 WRX / 2004+ STI | HH-2BOLT-SWAIN-EGT
Regular price $2,227.00Sale price $2,227.00 Regular priceUnit price per$2,227.00 -
Verus Engineering 02-21 WRX/STI / 13-21 BRZ/FRS/86 RLA Oil Cap Anodized Red | A0270A-RED
Regular price $78.10Sale price $78.10 Regular priceUnit price per$71.00 -
Up to $178 off
In StockTomei ARMS BX8265 Turbo Subaru Models | inc. 2002-2007 WRX / 2004+ STI | TB403A-SB01C
Only 4 leftRegular price $1,602.00Sale price $1,602.00 Regular priceUnit price per$1,780.00 -
Verus Engineering 02-21 WRX/STI / 13-21 BRZ/FRS/86 RLA Oil Cap Anodized Red | A0270A-BLK
Regular price $78.10Sale price $78.10 Regular priceUnit price per$71.00 -
In StockHKS Racing 15-21 STI Suction Brushed Intake Kit | 70020-AF108
Only 9 leftRegular price $495.00Sale price $495.00 Regular priceUnit price per$495.00 -
Up to $101.65 offTorque Solution 08-21 STI / 08-14 WRX PTFE Fuel Line Kit for for -6 Aeromotive FPR | TS-SU-6FLK-AM-P-08
Regular price $365.00Sale price $365.00 Regular priceUnit price per$466.65
![Perrin [16 - 17 STI] Cold Air Intake - Hyper Pink | PSP - INT - 323HP - JDMuscleIntakesperPSP-INT-323HP](http://jdmuscleusa.com/cdn/shop/files/perrin-16-17-sti-cold-air-intake-hyper-pink-psp-int-323hp-6245587.jpg?v=1770329378&width=220)
![Perrin [16 - 17 STI] Cold Air Intake - Hyper Pink | PSP - INT - 323HP - JDMuscleIntakesperPSP-INT-323HP](http://jdmuscleusa.com/cdn/shop/files/perrin-16-17-sti-cold-air-intake-hyper-pink-psp-int-323hp-8770232.jpg?v=1770329378&width=220)
