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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![Cobb [07 - 09 Legacy Spec B] Flex Fuel Ethanol Sensor Kit - JDMuscleFuel Pressure Sensorcobb316650](//jdmuscleusa.com/cdn/shop/products/cobb-07-09-legacy-spec-b-flex-fuel-ethanol-sensor-kit-7195876.jpg?v=1772953628&width=220)
![Cobb [07 - 09 Legacy Spec B] Flex Fuel Ethanol Sensor Kit - JDMuscleFuel Pressure Sensorcobb316650](//jdmuscleusa.com/cdn/shop/files/cobb-07-09-legacy-spec-b-flex-fuel-ethanol-sensor-kit-3896810.webp?v=1772953627&width=220)
Cobb Flex Fuel Ethanol Sensor Kit
Fits: 07-09 Legacy Spec B
Regular price $650.00Sale price $650.00 Regular priceUnit price per$650.00 -
Up to $18 offBLOX Racing 08-14 WRX/08-20 STi Air Box Intake Hose - Red | BXFL-50210-RD
Regular price $72.00Sale price $72.00 Regular priceUnit price per$90.00 -
Up to $18 offBLOX Racing 08-14 WRX / 08-20 STi Air Box Intake Hose - Blue | BXFL-50210-BL
Regular price $72.00Sale price $72.00 Regular priceUnit price per$90.00 -
Up to $5.20 offBLOX Racing 02-07 WRX/04-19 STI - Black Intercooler Coupler Hose Kit | BXFL-50215-BK
Regular price $20.80Sale price $20.80 Regular priceUnit price per$26.00 -
Up to $5 offBLOX Racing 02-07 WRX/04-19 STI - Blue Intercooler Coupler Hose Kit | BXFL-50215-BL
Regular price $20.00Sale price $20.00 Regular priceUnit price per$25.00 -
Up to $5.20 offBLOX Racing 02-07 WRX/04-19 STI - Red Intercooler Coupler Hose Kit | BXFL-50215-RD
Regular price $20.80Sale price $20.80 Regular priceUnit price per$26.00 -
Up to $23 offBLOX Racing 2015+ WRX/STI Fender Shrouds - Black | BXAC-50310-BK
Regular price $92.00Sale price $92.00 Regular priceUnit price per$115.00 -
Up to $23 offBLOX Racing 2015+ WRX/STI Fender Shrouds - Blue | BXAC-50310-BL
Regular price $92.00Sale price $92.00 Regular priceUnit price per$115.00 -
Up to $24 offBLOX Racing 2015+ WRX/STI Fender Shrouds - Red | BXAC-50310-RD
Regular price $96.00Sale price $96.00 Regular priceUnit price per$120.00 -
Up to $23 offBLOX Racing 2015+ WRX/STI Fender Shrouds - White | BXAC-50310-WH
Regular price $92.00Sale price $92.00 Regular priceUnit price per$115.00 -
![Revel [15 - 21 WRX/STI] GT Dry Carbon Belt Cover Replacement - 1 Piece | 1TR4GT0AS25 - JDMuscleBelt Coversrvl1TR4GT0AS25](//jdmuscleusa.com/cdn/shop/products/revel-15-21-wrxsti-gt-dry-carbon-belt-cover-replacement-1-piece-1tr4gt0as25-4016363.jpg?v=1770330550&width=220)
![Revel [15 - 21 WRX/STI] GT Dry Carbon Belt Cover Replacement - 1 Piece | 1TR4GT0AS25 - JDMuscleBelt Coversrvl1TR4GT0AS25](//jdmuscleusa.com/cdn/shop/products/revel-15-21-wrxsti-gt-dry-carbon-belt-cover-replacement-1-piece-1tr4gt0as25-3561622.jpg?v=1770330550&width=220)
Up to $13.50 offRevel GT Dry Carbon Belt Cover Replacement - 1 Piece | 1TR4GT0AS25
Fits: 15-21 WRX/STI
Regular price $256.50Sale price $256.50 Regular priceUnit price per$270.00 -
In StockMagnaFlow 11-14 Impreza/15-19 WRX/STI Competition Axle Back w/ Quad Polished Tips | 19362
Only 1 leftRegular price $741.00Sale price $741.00 Regular priceUnit price per$741.00 -
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1437545.jpg?v=1781013744&width=220)
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1858386.jpg?v=1781013744&width=220)
Up to $266.50 offPerrin Oil Cooler Kit w/PERRIN Core
Fits: 15-21 WRX
Regular price $799.50Sale price $799.50 Regular priceUnit price per$1,066.00 -
ETS Stock Turbo - Stock MAF - TiAL BOV - Wrinkle Black Subaru STI 15-21 | 200-30-ICP-003
Regular price $830.00Sale price $830.00 Regular priceUnit price per$830.00 -
ETS 15-21 WRX /15-18 STI Axle Back Exhaust Stainless Burnt Tips w/ No Muffler | 200-30-EXH-002
Regular price $595.00Sale price $595.00 Regular priceUnit price per$595.00 -
ETS Titanium Rotated Turbo - Stock BOV - Titanium - Burned Subaru STI 15-2020 | 200-30-ICP-017
Regular price $1,495.00Sale price $1,495.00 Regular priceUnit price per$1,495.00
![Cobb [07 - 09 Legacy Spec B] Flex Fuel Ethanol Sensor Kit - JDMuscleFuel Pressure Sensorcobb316650](http://jdmuscleusa.com/cdn/shop/products/cobb-07-09-legacy-spec-b-flex-fuel-ethanol-sensor-kit-7195876.jpg?v=1772953628&width=220)
![Cobb [07 - 09 Legacy Spec B] Flex Fuel Ethanol Sensor Kit - JDMuscleFuel Pressure Sensorcobb316650](http://jdmuscleusa.com/cdn/shop/files/cobb-07-09-legacy-spec-b-flex-fuel-ethanol-sensor-kit-3896810.webp?v=1772953627&width=220)
![Revel [15 - 21 WRX/STI] GT Dry Carbon Belt Cover Replacement - 1 Piece | 1TR4GT0AS25 - JDMuscleBelt Coversrvl1TR4GT0AS25](http://jdmuscleusa.com/cdn/shop/products/revel-15-21-wrxsti-gt-dry-carbon-belt-cover-replacement-1-piece-1tr4gt0as25-4016363.jpg?v=1770330550&width=220)
![Revel [15 - 21 WRX/STI] GT Dry Carbon Belt Cover Replacement - 1 Piece | 1TR4GT0AS25 - JDMuscleBelt Coversrvl1TR4GT0AS25](http://jdmuscleusa.com/cdn/shop/products/revel-15-21-wrxsti-gt-dry-carbon-belt-cover-replacement-1-piece-1tr4gt0as25-3561622.jpg?v=1770330550&width=220)
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1437545.jpg?v=1781013744&width=220)
![Perrin [15-21 WRX] Oil Cooler Kit w/PERRIN Core - JDMuscleOil Control DevicesperPSP-OIL-111](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrx-oil-cooler-kit-wperrin-core-1858386.jpg?v=1781013744&width=220)
