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 $1 offHPS Performance 08-14 WRX / 08-21 STI / 09-13 FXT Silicone Radiator Hose Kit Blue | 57-1064-BLUE
Regular price $153.00Sale price $153.00 Regular priceUnit price per$154.00 -
Up to $10 offHPS Performance 15-20 STI Blue Cold Air Intake w/ Heatshield | 837-573BL
Regular price $271.00Sale price $271.00 Regular priceUnit price per$281.00 -
CP-E cp-e 15-18 STI / 15-21 WRX Austenite Dual Muffler Axle Back Exhaust w/ Titan Finish 4" Double Wall Tips | SBAE00002T
Regular price $1,000.00Sale price $1,000.00 Regular priceUnit price per$1,000.00 -
CP-E cp-e 15-18 STI / 15-21 WRX Austenite Dual Muffler Axle Back Exhaust w/ Polished 4" Double Wall Tips | SBAE00002P
Regular price $1,000.00Sale price $1,000.00 Regular priceUnit price per$1,000.00 -
CP-E cp-e 15-18 STI / 15-21 WRX Austenite Dual Muffler Axle Back Exhaust w/ Black 4" Double Wall Tips | SBAE00002B
Regular price $1,247.00Sale price $1,247.00 Regular priceUnit price per$1,247.00 -
Up to $14 offHPS Performance 15-21 STI Full Cooling System Hose Kit Black | 57-1516-BLK
Regular price $318.00Sale price $318.00 Regular priceUnit price per$332.00 -
![COBB [15 - 21 STI] NexGen Stage 2 Power Package w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2-RED](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-power-package-w-redline-carbon-fiber-intake-1810952.jpg?v=1770330683&width=220)
![COBB [15 - 21 STI] NexGen Stage 2 Power Package w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2-RED](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-power-package-w-redline-carbon-fiber-intake-1550889.jpg?v=1770330683&width=220)
In StockCOBB NexGen Stage 2 Power Package w/ Redline Carbon Fiber Intake
Fits: 15-21 STI
Only 15 leftRegular price $3,680.00Sale price $3,680.00 Regular priceUnit price per$3,680.00 -
Up to $168.23 off
In StockMBRP 11-21 WRX Sedan / STI Sedan Armor Pro Series Single Exit Catback w/ Polished Tip | S4803304
Only 3 leftRegular price $714.99Sale price $714.99 Regular priceUnit price per$883.22 -
Process West 02-14 WRX / 04-21 STI Engine Pulley Garnish Red | PWED02R
Regular price $78.65Sale price $78.65 Regular priceUnit price per$78.65 -
Process West 08-21 STI Boost Soleniod Cover Black | PWED01B
Regular price $50.13Sale price $50.13 Regular priceUnit price per$50.13 -
IAG Performance V3 Top Feed Fuel Rails Gold
Fits: 02-14 WRX, 07-21 STI, 08-12 LGT, 06-13 FXT
Regular price $219.99Sale price $219.99 Regular priceUnit price per$219.99 -
Kartboy 02-14 WRX / 04-21 STI / 05-09 Legacy / 03-13 Forester Aluminum Crank Pulley V2 | KB-050-EJ-V2
Regular price $100.00Sale price $100.00 Regular priceUnit price per$100.00 -
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3.5" Single Wall Neochrome Tips and 5" Mufflers | SUAB15WRX - 5MU - 35NEO - JDMuscleAxle Back ExhaustsSUAB15WRX-5MU-35NEO](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-35-single-wall-neochrome-tips-and-5-mufflers-suab15wrx-5mu-35neo-5996692.jpg?v=1770327909&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back 3.5" Single Wall Polished Tips and No Muffler | SUAB15WRX - 0MU - 35SSW - JDMuscleAxle Back ExhaustsSUAB15WRX-0MU-35SSW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-35-single-wall-polished-tips-and-no-muffler-suab15wrx-0mu-35ssw-1129950.jpg?v=1770327693&width=220)
Nameless Performance Axle Back Exhaust w/ 3.5" Single Wall Neochrome Tips and 5" Mufflers
Fits: 15-21 WRX, 15-18 STI
Regular price $1,000.00Sale price $1,000.00 Regular priceUnit price per$668.00 -
IAG Black Timing Belt Kit w/ OEM Tensioner / Idlers and IAG Guide
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $599.99Sale price $599.99 Regular priceUnit price per$599.99 -
Subaru OEM Serpentine Belt 2010-21 STI | 809218460
Regular price $31.25Sale price $31.25 Regular priceUnit price per$31.25 -
Subaru OEM Outer Middle Timing Cover Most Turbo Subaru Models | 13570AA045
Regular price $38.23Sale price $38.23 Regular priceUnit price per$38.23
![COBB [15 - 21 STI] NexGen Stage 2 Power Package w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2-RED](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-power-package-w-redline-carbon-fiber-intake-1810952.jpg?v=1770330683&width=220)
![COBB [15 - 21 STI] NexGen Stage 2 Power Package w/ Redline Carbon Fiber Intake - JDMuscleEngine Package DealscobbSUB004NG2S2-RED](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-power-package-w-redline-carbon-fiber-intake-1550889.jpg?v=1770330683&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3.5" Single Wall Neochrome Tips and 5" Mufflers | SUAB15WRX - 5MU - 35NEO - JDMuscleAxle Back ExhaustsSUAB15WRX-5MU-35NEO](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-35-single-wall-neochrome-tips-and-5-mufflers-suab15wrx-5mu-35neo-5996692.jpg?v=1770327909&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back 3.5" Single Wall Polished Tips and No Muffler | SUAB15WRX - 0MU - 35SSW - JDMuscleAxle Back ExhaustsSUAB15WRX-0MU-35SSW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-35-single-wall-polished-tips-and-no-muffler-suab15wrx-0mu-35ssw-1129950.jpg?v=1770327693&width=220)
