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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JE Pistons and Rings 99.5 Bore 79mm Stroke 11.5 Comp 1999+ Subaru EJ25 SOHC | 314344
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
JE Pistons and Rings 99.5 Bore 79mm Stroke 8.5 Comp 1999+ Subaru EJ25 SOHC | 314341
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
JE Pistons and Rings 99.75 Bore 79mm Stroke 8.5 Comp 1999+ Subaru EJ25 SOHC | 314342
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
JE Pistons and Rings 99.75 Bore 79mm Stroke 11.5 Comp 1999+ Subaru EJ25 SOHC | 314345
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
JE Pistons and Rings 100 Bore 79mm Stroke 8.5 Comp 1999+ Subaru EJ25 SOHC | 314343
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
JE Pistons and Rings 100 Bore 79mm Stroke 11.5 Comp 1999+ Subaru EJ25 SOHC | 314346
Regular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
In StockJE Pistons and Rings 99.75 Bore 79mm Stroke 9.5:1 Comp WRX/STI EJ257 2004-2019 | 310937
Only 2 leftRegular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
JE Pistons 99.5mm Ring Sets - Universal | JC3104-3917
Regular price $147.99Sale price $147.99 Regular priceUnit price per$147.99 -
Up to $12 off
In StockGates Micro-V Stretch A/C Belt WRX 2008-2014 / STI 2008-2019 | K040317SF
Only 15 leftRegular price $47.00Sale price $47.00 Regular priceUnit price per$59.00 -
Up to $3.13 offARP Moly Assembly Lube 1.69 oz - Universal | 100-9903
Regular price $7.30Sale price $7.30 Regular priceUnit price per$10.43 -
In StockaFe Filter Cleaning Kit Power Restore Kit Squeeze Gold 16 oz. - Universal | 90-50500
Only 3 leftRegular price $21.00Sale price $21.00 Regular priceUnit price per$21.00 -
Up to $8.99 off
In StockTorque Solution 08-14 WRX / 08-21 STI / 05-09 LGT Post MAF Silicone Intake Hose Black | TS-SU-009
Only 4 leftRegular price $56.00Sale price $56.00 Regular priceUnit price per$64.99 -
Up to $1.32 off
In StockTorque Solution Throttle Body Hose Coupler WRX 2002-2007 / STI 2004-2019
Only 2 leftRegular price $32.00Sale price $32.00 Regular priceUnit price per$33.32 -
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT] Phenolic Thermal Spacer 8mm | 019001](//jdmuscleusa.com/cdn/shop/products/grimmspeed-3x-thick-8mm-phenolic-spacer-wrx-sti-legacy-gt-forester-xt-019001-phenolic-thermal-intake-manifold-spacers-grimmspeed-grm019001.jpg?v=1614517849&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT] Phenolic Thermal Spacer 8mm | 019001](//jdmuscleusa.com/cdn/shop/files/grimmspeed-phenolic-thermal-spacer-8mm-2002-2014-wrx-2004-2021-sti-2005-2012-lgt-2004-2013-fxt-019001-780723_500x500_ef3883b7-1e66-4832-af53-12f192e8f8ad.jpg?v=1688750773&width=220)
GrimmSpeed Phenolic Thermal Spacer 8mm | 019001
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $94.00Sale price $94.00 Regular priceUnit price per$94.00 -
Up to $18 offPerrin 08-21 WRX/STI / 05-09 LGT / 13-17 Crosstrek / 14-15 FXT Panel Filter | PSP-INT-110
Regular price $54.00Sale price $54.00 Regular priceUnit price per$72.00 -
Up to $29 offAEM V2 5 Gal Tank Kit w/ Conductive Fluid Level Sensor - Universal | 30-3320
Regular price $230.95Sale price $230.95 Regular priceUnit price per$259.95
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT] Phenolic Thermal Spacer 8mm | 019001](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-3x-thick-8mm-phenolic-spacer-wrx-sti-legacy-gt-forester-xt-019001-phenolic-thermal-intake-manifold-spacers-grimmspeed-grm019001.jpg?v=1614517849&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT] Phenolic Thermal Spacer 8mm | 019001](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-phenolic-thermal-spacer-8mm-2002-2014-wrx-2004-2021-sti-2005-2012-lgt-2004-2013-fxt-019001-780723_500x500_ef3883b7-1e66-4832-af53-12f192e8f8ad.jpg?v=1688750773&width=220)
