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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GrimmSpeed Front Mount Intercooler Core Coated Black Subaru 15-21 WRX / 15-21 STI | GRM090260
Regular price $1,329.00Sale price $1,329.00 Regular priceUnit price per$1,329.00 -
GrimmSpeed Front Mount Intercooler Pipe Kit Red Subaru STI 15-21 | GRM090231
Regular price $908.00Sale price $908.00 Regular priceUnit price per$908.00 -
Grimmspeed The Bolt Oil Cap Yellow Zinc Subaru Models 89-19 / 89-19 FRS/86 | grm120014Y
Regular price $92.00Sale price $92.00 Regular priceUnit price per$92.00 -
GrimmSpeed Dry-Con Performance Panel Air Filter Subaru BRZ 2012-21 MT / BRZ 2017-2019 AT | 060094
Regular price $82.00Sale price $82.00 Regular priceUnit price per$82.00 -
Up to $18.75 offPerrin Performance FMIC Hose Clamp Kit WRX 2002-2017 / STI 2004-2017 | PSP-ITR-413
Regular price $56.25Sale price $56.25 Regular priceUnit price per$75.00 -
Up to $16 offPERRIN Performance Hose Clamp Kit Subaru STI 15-2020 | PSP-ITR-415
Regular price $48.00Sale price $48.00 Regular priceUnit price per$64.00 -
![PERRIN Performance [15-20 STI] Coolant Overflow Tank | ASM-ENG-502 - JDMuscleOverflow / Expansion TanksperASM-ENG-502](//jdmuscleusa.com/cdn/shop/products/perrin-performance-15-20-sti-coolant-overflow-tank-asm-eng-502-1884067.jpg?v=1781013195&width=220)
Up to $35.10 offPERRIN Performance Coolant Overflow Tank | ASM-ENG-502
Fits: 15-20 STI
Regular price $198.90Sale price $198.90 Regular priceUnit price per$234.00 -
DeatschWerks X2 Series Pump Module CPE Plumbing Kit for WRX 2008+ / STI 2008+ | dwk6-615
Regular price $749.00Sale price $749.00 Regular priceUnit price per$749.00 -
DeatschWerks X2 Series Pump Module PTFE Return Plumbing Kit WRX 2008-2014 / STI 2008-21 | dwk6-616
Regular price $849.00Sale price $849.00 Regular priceUnit price per$849.00 -
Up to $178 off
In StockTomei ARMS BX7760 Turbo Saab 9-2X 2005-2006 / Subaru Baja 2005-2006 / Forester 2004-2008 / Impreza WRX 2002-2007 / Impreza STI 2004-2007 / WRX STI 15-21 | TB403A-SB01A
Only 4 leftRegular price $1,602.00Sale price $1,602.00 Regular priceUnit price per$1,780.00 -
Up to $24.99 off
In StockPLM Precision Works Crank Pulley for Subaru EJ-Series Engine WRX 2002-2014 / STi 2004-21 / Forester XT 2003-2013 / Legacy 1994-2009 / Impreza 1993-2011| PW-SUB-EJ-CP-PARENT
Only 16 leftRegular price $75.00Sale price $75.00 Regular priceUnit price per$99.99 -
Up to $75 offPLM Oil Pan Baffle Kit WRX 15-17 / STI 15-17 / Impreza WRX 02-14 / STI 02-14 / Legacy GT 05-09 / Forester XT 04-13 / Outback XT 05-09 | PLM-OPB-WRX-KIT
Regular price $100.00Sale price $100.00 Regular priceUnit price per$175.00 -
FACTIONFAB 3D TURBO BLANKET BLACK 2015+ STI | FFA1.10109.2
Regular price $168.00Sale price $168.00 Regular priceUnit price per$140.00 -
FACTIONFAB AXLE BACK EXHAUST POLISHED 2019+ Subaru STI | FFA1.10228.1
Regular price $468.00Sale price $468.00 Regular priceUnit price per$390.00 -
FactionFab 19-21 STI Axle Back Exhaust Burnt Tip | FFA1.10228.2
Regular price $516.00Sale price $516.00 Regular priceUnit price per$430.00 -
JDMuscle Tanso Carbon Fiber Intake Trim Cover v2 - 2015+ WRX/STI
Regular price From $350.00Sale price From $350.00 Regular priceUnit price per$350.00
![PERRIN Performance [15-20 STI] Coolant Overflow Tank | ASM-ENG-502 - JDMuscleOverflow / Expansion TanksperASM-ENG-502](http://jdmuscleusa.com/cdn/shop/products/perrin-performance-15-20-sti-coolant-overflow-tank-asm-eng-502-1884067.jpg?v=1781013195&width=220)
