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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Torque Solution Billet Aluminum 1.25in Bypass Plug WRX/STI / EVO - Universal
Regular price $18.00Sale price $18.00 Regular priceUnit price per$18.00 -
Up to $6.05 off
In StockMishimoto Racing Thermostat | MMTS-WRX-01
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-05 FXT, 09 FXT
Regular price $64.95Sale price $64.95 Regular priceUnit price per$71.00 -
Up to $3.57 off
In StockMishimoto Transition Coupler 2.5-in to 3-in - Universal
Only 15 leftRegular price From $11.95Sale price From $11.95 Regular priceUnit price per$13.00 -
Up to $2.23 off
In StockMishimoto Transition Coupler 2-in to 2.5-in - Universal
Only 11 leftRegular price From $9.95Sale price From $9.95 Regular priceUnit price per$12.05 -
GrimmSpeed Front Mount Intercooler Kit - Black Core with Red Piping
Fits: 15-21 WRX
Regular price $2,319.00Sale price $2,319.00 Regular priceUnit price per$2,319.00 -
![Cobb [18 STI Type RA, 19 STI] Stage 3+ Flex Fuel Power Package | Titanium - Black - JDMuscleFlex FuelcobbSUB0041130FTI-BK](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-sti-stage-3-flex-fuel-power-package-titanium-black-5770544.jpg?v=1772959631&width=220)
![Cobb [18 STI Type RA, 19 STI] Stage 3+ Flex Fuel Power Package | Titanium - Black - JDMuscleFlex FuelcobbSUB0041130FTI-BK](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-sti-stage-3-flex-fuel-power-package-titanium-black-6802810.jpg?v=1772959631&width=220)
Cobb Stage 3+ Flex Fuel Power Package | Titanium - Black
Fits: 18 STI Type RA, 19 STI
Regular price $0.00Sale price $0.00 Regular priceUnit price per$0.00 -
IAG Performance Turbo Blanket Heat Shield Most Subaru Turbo Models w/ IWG
Regular price $139.99Sale price $139.99 Regular priceUnit price per$139.99 -
Cobb Tuning Battery Tie Down - Subaru Models
Regular price $65.00Sale price $65.00 Regular priceUnit price per$65.00 -
In StockOVERTAKE Maxx Flo Panel Filter
Fits: 22-26 WRX, 19-21 STI, 19-26 Ascent, 19-23 Forester, 20-25 Legacy, 20-26 Outback
Regular price $75.00Sale price $75.00 Regular priceUnit price per$75.00 -
Up to $86.99 offTorque Solution HD Cast Aluminum Turbo Inlet 2.4-inch Hard Inlet Pipe
Fits: 02-07 WRX, 04-21 STI
Regular price $313.00Sale price $313.00 Regular priceUnit price per$399.99 -
![Cobb [15 - 18 STI] Titanium Stage 3 Power Package - JDMuscleEngine Package DealscobbSUB0041030TI-BKStealth Black Intake System](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-titanium-stage-3-power-package-7874736.jpg?v=1770336209&width=220)
![Cobb [15 - 18 STI] Titanium Stage 3 Power Package - JDMuscleEngine Package DealscobbSUB0041030TI-BKStealth Black Intake System](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-titanium-stage-3-power-package-2336937.jpg?v=1770336209&width=220)
Cobb Titanium Stage 3 Power Package
Fits: 15-18 STI
Regular price $5,745.00Sale price $5,745.00 Regular priceUnit price per$5,745.00 -
![Radium Engineering [08 - 21 WRX STI EJ257 Only] RA - Series Fuel Pressure Regulator Kit | 20 - 0965 - JDMuscleFuel Pressure Regulatorsrad20-0965](//jdmuscleusa.com/cdn/shop/files/radium-engineering-08-21-wrx-sti-ej257-only-ra-series-fuel-pressure-regulator-kit-20-0965-1050469.jpg?v=1770318560&width=220)
![Radium Engineering [08 - 21 WRX STI EJ257 Only] RA - Series Fuel Pressure Regulator Kit | 20 - 0965 - JDMuscleFuel Pressure Regulatorsrad20-0965](//jdmuscleusa.com/cdn/shop/files/radium-engineering-08-21-wrx-sti-ej257-only-ra-series-fuel-pressure-regulator-kit-20-0965-5346760.jpg?v=1770318560&width=220)
Radium Engineering RA-Series Fuel Pressure Regulator Kit
Fits: 08-21 WRX STI EJ257 Only
Regular price $256.45Sale price $256.45 Regular priceUnit price per -
![Forced Performance [STI/WRX] Blue Turbo BB LOPE 58mm CH8 CM Turbine Hsg Internal WG w/Oil Line | 2024000 - JDMuscleTurbosfpt2024000](//jdmuscleusa.com/cdn/shop/files/forced-performance-stiwrx-blue-turbo-bb-lope-58mm-ch8-cm-turbine-hsg-internal-wg-woil-line-2024000-4948865.jpg?v=1770325033&width=220)
Forced Performance Blue Turbo BB LOPE 58mm CH8 CM Turbine Hsg Internal WG w/Oil Line | 2024000
Fits: STI/WRX
Regular price $1,799.00Sale price $1,799.00 Regular priceUnit price per$1,799.00 -
![Mishimoto [08 - 15 WRX/STI] PNP Aluminum Fan Shroud Black | MMFS - STI - 08PBK - JDMuscleElectric FansmisMMFS-STI-08PBK](//jdmuscleusa.com/cdn/shop/products/mishimoto-08-15-wrxsti-pnp-aluminum-fan-shroud-black-mmfs-sti-08pbk-9276511.png?v=1770329012&width=220)
![Mishimoto [08 - 15 WRX/STI] PNP Aluminum Fan Shroud Black | MMFS - STI - 08PBK - JDMuscleElectric FansmisMMFS-STI-08PBK](//jdmuscleusa.com/cdn/shop/products/mishimoto-08-15-wrxsti-pnp-aluminum-fan-shroud-black-mmfs-sti-08pbk-7065278.png?v=1770329012&width=220)
Up to $36.05 off
In StockMishimoto PNP Aluminum Fan Shroud Black | MMFS-STI-08PBK
Fits: 08-15 WRX/STI
Only 5 leftRegular price $359.95Sale price $359.95 Regular priceUnit price per$396.00 -
![Cobb [08+ WRX/STI, 05 - 09 LGT] Replacement Hardware Intake Air Box - JDMuscleIntake Misc.cobb724150-HW](//jdmuscleusa.com/cdn/shop/files/cobb-08-wrxsti-05-09-lgt-replacement-hardware-intake-air-box-1469437.jpg?v=1770321309&width=220)
Cobb Replacement Hardware Intake Air Box
Fits: 08+ WRX/STI, 05-09 LGT
Regular price $17.00Sale price $17.00 Regular priceUnit price per$17.00 -
![COBB [19 - 21 STI, 18 STI Type RA] Stage 1+ Power Package w/ SF Intake | SUB0040S1P - BK - JDMuscleEngine Package DealscobbSUB0040S1P-BKBlack](//jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-stage-1-power-package-w-sf-intake-sub0040s1p-bk-8665827.jpg?v=1770336433&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] Stage 1+ Power Package w/ SF Intake | SUB0040S1P - BK - JDMuscleEngine Package DealscobbSUB0040S1P-BKBlack](//jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-stage-1-power-package-w-sf-intake-sub0040s1p-bk-4613204.jpg?v=1770336434&width=220)
In StockCOBB Stage 1+ Power Package w/ SF Intake
Fits: 19-21 STI, 18 STI Type RA
Regular price $1,315.00Sale price $1,315.00 Regular priceUnit price per$1,315.00
![Cobb [18 STI Type RA, 19 STI] Stage 3+ Flex Fuel Power Package | Titanium - Black - JDMuscleFlex FuelcobbSUB0041130FTI-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-sti-stage-3-flex-fuel-power-package-titanium-black-5770544.jpg?v=1772959631&width=220)
![Cobb [18 STI Type RA, 19 STI] Stage 3+ Flex Fuel Power Package | Titanium - Black - JDMuscleFlex FuelcobbSUB0041130FTI-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-sti-stage-3-flex-fuel-power-package-titanium-black-6802810.jpg?v=1772959631&width=220)
![Cobb [15 - 18 STI] Titanium Stage 3 Power Package - JDMuscleEngine Package DealscobbSUB0041030TI-BKStealth Black Intake System](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-titanium-stage-3-power-package-7874736.jpg?v=1770336209&width=220)
![Cobb [15 - 18 STI] Titanium Stage 3 Power Package - JDMuscleEngine Package DealscobbSUB0041030TI-BKStealth Black Intake System](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-titanium-stage-3-power-package-2336937.jpg?v=1770336209&width=220)
![Radium Engineering [08 - 21 WRX STI EJ257 Only] RA - Series Fuel Pressure Regulator Kit | 20 - 0965 - JDMuscleFuel Pressure Regulatorsrad20-0965](http://jdmuscleusa.com/cdn/shop/files/radium-engineering-08-21-wrx-sti-ej257-only-ra-series-fuel-pressure-regulator-kit-20-0965-1050469.jpg?v=1770318560&width=220)
![Radium Engineering [08 - 21 WRX STI EJ257 Only] RA - Series Fuel Pressure Regulator Kit | 20 - 0965 - JDMuscleFuel Pressure Regulatorsrad20-0965](http://jdmuscleusa.com/cdn/shop/files/radium-engineering-08-21-wrx-sti-ej257-only-ra-series-fuel-pressure-regulator-kit-20-0965-5346760.jpg?v=1770318560&width=220)
![Forced Performance [STI/WRX] Blue Turbo BB LOPE 58mm CH8 CM Turbine Hsg Internal WG w/Oil Line | 2024000 - JDMuscleTurbosfpt2024000](http://jdmuscleusa.com/cdn/shop/files/forced-performance-stiwrx-blue-turbo-bb-lope-58mm-ch8-cm-turbine-hsg-internal-wg-woil-line-2024000-4948865.jpg?v=1770325033&width=220)
![Mishimoto [08 - 15 WRX/STI] PNP Aluminum Fan Shroud Black | MMFS - STI - 08PBK - JDMuscleElectric FansmisMMFS-STI-08PBK](http://jdmuscleusa.com/cdn/shop/products/mishimoto-08-15-wrxsti-pnp-aluminum-fan-shroud-black-mmfs-sti-08pbk-9276511.png?v=1770329012&width=220)
![Mishimoto [08 - 15 WRX/STI] PNP Aluminum Fan Shroud Black | MMFS - STI - 08PBK - JDMuscleElectric FansmisMMFS-STI-08PBK](http://jdmuscleusa.com/cdn/shop/products/mishimoto-08-15-wrxsti-pnp-aluminum-fan-shroud-black-mmfs-sti-08pbk-7065278.png?v=1770329012&width=220)
![Cobb [08+ WRX/STI, 05 - 09 LGT] Replacement Hardware Intake Air Box - JDMuscleIntake Misc.cobb724150-HW](http://jdmuscleusa.com/cdn/shop/files/cobb-08-wrxsti-05-09-lgt-replacement-hardware-intake-air-box-1469437.jpg?v=1770321309&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] Stage 1+ Power Package w/ SF Intake | SUB0040S1P - BK - JDMuscleEngine Package DealscobbSUB0040S1P-BKBlack](http://jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-stage-1-power-package-w-sf-intake-sub0040s1p-bk-8665827.jpg?v=1770336433&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] Stage 1+ Power Package w/ SF Intake | SUB0040S1P - BK - JDMuscleEngine Package DealscobbSUB0040S1P-BKBlack](http://jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-stage-1-power-package-w-sf-intake-sub0040s1p-bk-4613204.jpg?v=1770336434&width=220)