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 [Subaru Models inc. 02-14 WRX / 04-21 STI] Lightweight Crank Pulley | 095015BK](//jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-crank-pulley-1998-2001-subaru-impreza-25rs-pulleys-grimmspeed-black-095015bk-2.jpg?v=1742240962&width=220)
GrimmSpeed Lightweight Crank Pulley | 095015BK
Fits: Subaru Models inc. 02-14 WRX / 04-21 STI
Regular price $189.00Sale price $189.00 Regular priceUnit price per$189.00 -
Up to $114.40 offPerrin Air Oil Separator Black w/ FMIC | PSP-ENG-607BK
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT
Regular price $457.60Sale price $457.60 Regular priceUnit price per$572.00 -
Killer B Motorsport 02-14 WRX / 04-21 STI Cast High Performance Oil Pan Silver | EJ25PAN
Regular price $549.00Sale price $549.00 Regular priceUnit price per$549.00 -
Subaru OEM Cam Seal Subaru 2.5L SOHC EJ251 Subaru All Models | 806732150
Regular price $10.10Sale price $10.10 Regular priceUnit price per$10.10 -
Subaru OEM Water Pump Gasket 02-14 WRX / 04-19 STI / 05-09 Legacy GT / 04-13 Forester XT | 21114AA051
Regular price $4.98Sale price $4.98 Regular priceUnit price per$4.98 -
Subaru OEM Cam Gear Bolt WRX 2006-2014 / STI 2004-2019 / Forester XT 2004-2008 | 13199AA000
Regular price $6.88Sale price $6.88 Regular priceUnit price per$6.88 -
Up to $22.91 off
In StockARP Connecting Rod Bolt Kit Carrillo Replacement 625+ 8pc - Universal | 300-6703
Only 2 leftRegular price $311.00Sale price $311.00 Regular priceUnit price per$333.91 -
Up to $1.96 off
In StockARP Rod Bolt Kit WRX/STI EJ25 DOHC Subaru Turbo Models 2004-2019 | 260-6302
Only 3 leftRegular price $98.00Sale price $98.00 Regular priceUnit price per$99.96 -
GrimmSpeed EJ25 DAVCS Head Gasket Set - Subaru STi 2008-2020 | 12400X
Regular price $203.00Sale price $203.00 Regular priceUnit price per$203.00 -
GrimmSpeed WRX/STI/LGT/FXT 3-Bolt Manifold to Up Pipe Gasket | 034001
Regular price $22.00Sale price $22.00 Regular priceUnit price per$22.00 -
GrimmSpeed Head Gasket Set - EJ25 SAVCS STI / WRX / LGT 2004-2014 | 12400X
Regular price $203.00Sale price $203.00 Regular priceUnit price per$203.00 -
Up to $2.22 offSupertech Subaru EJ20/EJ25 Manganese Bronze Intake Valve Guide 6mm Stem
Regular price $8.89Sale price $8.89 Regular priceUnit price per$11.11 -
Ferrea Titanium Valve Spring Retainers | Subaru STi EJ25
Regular price $344.74Sale price $344.74 Regular priceUnit price per$344.74 -
Up to $18.70 offGo Fast Bits Non-Underdrive Crank Pulley | Subaru EJ20 / EJ25 | 2009
Regular price $168.30Sale price $168.30 Regular priceUnit price per$187.00 -
Up to $38.09 off
In StockGo Fast Bits 08-14 WRX / 08-21 STI Underdrive Pulley Kit | 2014
Only 5 leftRegular price $342.81Sale price $342.81 Regular priceUnit price per$380.90 -
Up to $8.76 offGSC Power-Division Intake Valve Guides WRX 2002-2014 / STI 2004-2020 Subaru Turbo Models
Regular price $49.65Sale price $49.65 Regular priceUnit price per$58.41
![GrimmSpeed [Subaru Models inc. 02-14 WRX / 04-21 STI] Lightweight Crank Pulley | 095015BK](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-crank-pulley-1998-2001-subaru-impreza-25rs-pulleys-grimmspeed-black-095015bk-2.jpg?v=1742240962&width=220)
