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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![Moroso [02-07 WRX, 04-19 STI, 04-08 FXT] Aluminum Coolant Expansion Tank - JDMuscleOverflow / Expansion Tanksmor63784](//jdmuscleusa.com/cdn/shop/products/moroso-02-07-wrx-04-19-sti-04-08-fxt-aluminum-coolant-expansion-tank-8680274.jpg?v=1781013312&width=220)
In StockMoroso Aluminum Coolant Expansion Tank
Fits: 02-07 WRX, 04-19 STI, 04-08 FXT
Only 8 leftRegular price $220.99Sale price $220.99 Regular priceUnit price per$220.99 -
GrimmSpeed Front Mount Intercooler Kit - Black Core with Black Piping
Fits: 15-21 WRX
Regular price $2,319.00Sale price $2,319.00 Regular priceUnit price per$2,319.00 -
IAG Replacement Hardware Set for IAG Top Feed Fuel Rails
Regular price $48.00Sale price $48.00 Regular priceUnit price per$48.00 -
In StockCobb Subaru EJ Turbo Blanket Black Lava
Only 9 leftRegular price $217.00Sale price $217.00 Regular priceUnit price per$217.00 -
![Cobb [Subaru / Mazda / Mitsubishi] EBCS 1/4inch EWG Fitting Kit | EWG - FITTING - UPGRADE - KIT - JDMuscleBoost Control SolenoidscobbEWG-FITTING-UPGRADE-KIT](//jdmuscleusa.com/cdn/shop/products/cobb-subaru-mazda-mitsubishi-ebcs-14inch-ewg-fitting-kit-ewg-fitting-upgrade-kit-6368460.jpg?v=1770336428&width=220)
In StockCobb EBCS 1/4inch EWG Fitting Kit
Fits: Subaru, Mazda, Mitsubishi
Only 13 leftRegular price $58.00Sale price $58.00 Regular priceUnit price per$58.00 -
In StockDeatschwerks 1000cc Bosch EV14 Fuel Injectors
Fits: 02-14 WRX, 07-21 STI, 07-12 LGT
Only 10 leftRegular price $469.00Sale price $469.00 Regular priceUnit price per$469.00 -
![PERRIN Upper Radiator Bracket Set - Blue [15 - 21 WRX/STI, 13 - 17 Crosstrek, 12 - 16 Impreza] - JDMuscleRadiator AccessoriesperPSP-ENG-523BL](//jdmuscleusa.com/cdn/shop/files/perrin-upper-radiator-bracket-set-blue-15-21-wrxsti-13-17-crosstrek-12-16-impreza-6921685.jpg?v=1770313940&width=220)
![PERRIN Upper Radiator Bracket Set - Blue [15 - 21 WRX/STI, 13 - 17 Crosstrek, 12 - 16 Impreza] - JDMuscleRadiator AccessoriesperPSP-ENG-523BL](//jdmuscleusa.com/cdn/shop/files/perrin-upper-radiator-bracket-set-blue-15-21-wrxsti-13-17-crosstrek-12-16-impreza-3083281.jpg?v=1770313940&width=220)
Up to $18.75 off
In StockPERRIN Upper Radiator Bracket Set - Blue
Fits: 15-21 WRX/STI, 13-17 Crosstrek, 12-16 Impreza
Only 9 leftRegular price $56.25Sale price $56.25 Regular priceUnit price per$75.00 -
In StockOVERTAKE TMIC Silicone Coupler Kit - 2004-2021 STI, 2002-2007 WRX, 2004-2008 Forester XT w/ STI Style TMIC
Regular price $88.00Sale price $88.00 Regular priceUnit price per$88.00 -
![Cobb [Subaru] Silicone Exhaust Hanger 12mm x 35mm - JDMuscleExhaust HangerscobbUNI-001-272](//jdmuscleusa.com/cdn/shop/files/cobb-subaru-silicone-exhaust-hanger-12mm-x-35mm-3590037.jpg?v=1770322211&width=220)
In StockCobb Silicone Exhaust Hanger 12mm x 35mm
Fits: Subaru
Regular price $20.00Sale price $20.00 Regular priceUnit price per$20.00 -
![CSF [08 - 21 WRX/STI] 2 - Row 42mm Race - Spec All Aluminum Radiator - Black | 7095B - JDMuscleRadiatorscsf7095B](//jdmuscleusa.com/cdn/shop/files/csf-08-21-wrxsti-2-row-42mm-race-spec-all-aluminum-radiator-black-7095b-8634755.jpg?v=1770324975&width=220)
![CSF [08 - 21 WRX/STI] 2 - Row 42mm Race - Spec All Aluminum Radiator - Black | 7095B - JDMuscleRadiatorscsf7095B](//jdmuscleusa.com/cdn/shop/files/csf-08-21-wrxsti-2-row-42mm-race-spec-all-aluminum-radiator-black-7095b-6844231.jpg?v=1770324975&width=220)
Up to $24 off
In StockCSF 2-Row 42mm Race-Spec All Aluminum Radiator - Black | 7095B
Fits: 08-21 WRX/STI
Only 18 leftRegular price $485.00Sale price $485.00 Regular priceUnit price per$509.00 -
![Torque Solution [08 - 14 WRX, 08 - 21 STI] Oil Fill Tube Relocation | TS - SU - 757 - JDMuscleOil Control DevicestqsTS-SU-757](//jdmuscleusa.com/cdn/shop/files/torque-solution-08-14-wrx-08-21-sti-oil-fill-tube-relocation-ts-su-757-7338747.jpg?v=1770325029&width=220)
![Torque Solution [08 - 14 WRX, 08 - 21 STI] Oil Fill Tube Relocation | TS - SU - 757 - JDMuscleOil Control DevicestqsTS-SU-757](//jdmuscleusa.com/cdn/shop/files/torque-solution-08-14-wrx-08-21-sti-oil-fill-tube-relocation-ts-su-757-9472488.jpg?v=1770325029&width=220)
Up to $28.77 off
In StockTorque Solution Oil Fill Tube Relocation
Fits: 08-14 WRX, 08-21 STI
Only 2 leftRegular price $149.00Sale price $149.00 Regular priceUnit price per$177.77 -
In StockHKS Fine Tune Power Steering / Alternator V-Belt
Fits: 08-21 STI, 08-14 WRX
Only 17 leftRegular price $58.00Sale price $58.00 Regular priceUnit price per$58.00 -
![Perrin [08 - 21 STI] Boost Solenoid Cover Hyper Pink | PSP - ENG - 161HP - JDMuscleBoost Control Solenoid CoversperPSP-ENG-161HP](//jdmuscleusa.com/cdn/shop/files/perrin-08-21-sti-boost-solenoid-cover-hyper-pink-psp-eng-161hp-9111797.jpg?v=1770327864&width=220)
![Perrin [08 - 21 STI] Boost Solenoid Cover Hyper Pink | PSP - ENG - 161HP - JDMuscleBoost Control Solenoid CoversperPSP-ENG-161HP](//jdmuscleusa.com/cdn/shop/files/perrin-08-21-sti-boost-solenoid-cover-hyper-pink-psp-eng-161hp-2631792.jpg?v=1770327865&width=220)
Up to $20 off
In StockPerrin Boost Solenoid Cover Hyper Pink | PSP-ENG-161HP
Fits: 08-21 STI
Only 4 leftRegular price $60.00Sale price $60.00 Regular priceUnit price per$80.00 -
![Perrin [15 - 21 WRX/STI] Radiator Shroud with OEM Intake Scoop - Hyper Pink | PSP - ENG - 512 - 4HP - JDMuscleRadiator ShroudsperPSP-ENG-512-4HP](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-hyper-pink-psp-eng-512-4hp-8991737.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud with OEM Intake Scoop - Hyper Pink | PSP - ENG - 512 - 4HP - JDMuscleRadiator ShroudsperPSP-ENG-512-4HP](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-hyper-pink-psp-eng-512-4hp-3281667.jpg?v=1770327921&width=220)
Up to $36.25 offPerrin Radiator Shroud with OEM Intake Scoop - Hyper Pink | PSP-ENG-512-4HP
Fits: 15-21 WRX/STI
Regular price $108.75Sale price $108.75 Regular priceUnit price per$145.00 -
COBB Redline Intake Replacement Intake Filter
Fits: 15-21 STI
Regular price $84.00Sale price $84.00 Regular priceUnit price per$84.00 -
IAG Performance 02-14 WRX / 04-21 STI / 05-09 LGT / 04-13 FXT V2 Oil Pickup and Oil Control Baffle / Windage Tray Combo | IAG-ENG-2101
Regular price $329.99Sale price $329.99 Regular priceUnit price per$329.99
![Moroso [02-07 WRX, 04-19 STI, 04-08 FXT] Aluminum Coolant Expansion Tank - JDMuscleOverflow / Expansion Tanksmor63784](http://jdmuscleusa.com/cdn/shop/products/moroso-02-07-wrx-04-19-sti-04-08-fxt-aluminum-coolant-expansion-tank-8680274.jpg?v=1781013312&width=220)
![Cobb [Subaru / Mazda / Mitsubishi] EBCS 1/4inch EWG Fitting Kit | EWG - FITTING - UPGRADE - KIT - JDMuscleBoost Control SolenoidscobbEWG-FITTING-UPGRADE-KIT](http://jdmuscleusa.com/cdn/shop/products/cobb-subaru-mazda-mitsubishi-ebcs-14inch-ewg-fitting-kit-ewg-fitting-upgrade-kit-6368460.jpg?v=1770336428&width=220)
![PERRIN Upper Radiator Bracket Set - Blue [15 - 21 WRX/STI, 13 - 17 Crosstrek, 12 - 16 Impreza] - JDMuscleRadiator AccessoriesperPSP-ENG-523BL](http://jdmuscleusa.com/cdn/shop/files/perrin-upper-radiator-bracket-set-blue-15-21-wrxsti-13-17-crosstrek-12-16-impreza-6921685.jpg?v=1770313940&width=220)
![PERRIN Upper Radiator Bracket Set - Blue [15 - 21 WRX/STI, 13 - 17 Crosstrek, 12 - 16 Impreza] - JDMuscleRadiator AccessoriesperPSP-ENG-523BL](http://jdmuscleusa.com/cdn/shop/files/perrin-upper-radiator-bracket-set-blue-15-21-wrxsti-13-17-crosstrek-12-16-impreza-3083281.jpg?v=1770313940&width=220)
![Cobb [Subaru] Silicone Exhaust Hanger 12mm x 35mm - JDMuscleExhaust HangerscobbUNI-001-272](http://jdmuscleusa.com/cdn/shop/files/cobb-subaru-silicone-exhaust-hanger-12mm-x-35mm-3590037.jpg?v=1770322211&width=220)
![CSF [08 - 21 WRX/STI] 2 - Row 42mm Race - Spec All Aluminum Radiator - Black | 7095B - JDMuscleRadiatorscsf7095B](http://jdmuscleusa.com/cdn/shop/files/csf-08-21-wrxsti-2-row-42mm-race-spec-all-aluminum-radiator-black-7095b-8634755.jpg?v=1770324975&width=220)
![CSF [08 - 21 WRX/STI] 2 - Row 42mm Race - Spec All Aluminum Radiator - Black | 7095B - JDMuscleRadiatorscsf7095B](http://jdmuscleusa.com/cdn/shop/files/csf-08-21-wrxsti-2-row-42mm-race-spec-all-aluminum-radiator-black-7095b-6844231.jpg?v=1770324975&width=220)
![Torque Solution [08 - 14 WRX, 08 - 21 STI] Oil Fill Tube Relocation | TS - SU - 757 - JDMuscleOil Control DevicestqsTS-SU-757](http://jdmuscleusa.com/cdn/shop/files/torque-solution-08-14-wrx-08-21-sti-oil-fill-tube-relocation-ts-su-757-7338747.jpg?v=1770325029&width=220)
![Torque Solution [08 - 14 WRX, 08 - 21 STI] Oil Fill Tube Relocation | TS - SU - 757 - JDMuscleOil Control DevicestqsTS-SU-757](http://jdmuscleusa.com/cdn/shop/files/torque-solution-08-14-wrx-08-21-sti-oil-fill-tube-relocation-ts-su-757-9472488.jpg?v=1770325029&width=220)
![Perrin [08 - 21 STI] Boost Solenoid Cover Hyper Pink | PSP - ENG - 161HP - JDMuscleBoost Control Solenoid CoversperPSP-ENG-161HP](http://jdmuscleusa.com/cdn/shop/files/perrin-08-21-sti-boost-solenoid-cover-hyper-pink-psp-eng-161hp-9111797.jpg?v=1770327864&width=220)
![Perrin [08 - 21 STI] Boost Solenoid Cover Hyper Pink | PSP - ENG - 161HP - JDMuscleBoost Control Solenoid CoversperPSP-ENG-161HP](http://jdmuscleusa.com/cdn/shop/files/perrin-08-21-sti-boost-solenoid-cover-hyper-pink-psp-eng-161hp-2631792.jpg?v=1770327865&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud with OEM Intake Scoop - Hyper Pink | PSP - ENG - 512 - 4HP - JDMuscleRadiator ShroudsperPSP-ENG-512-4HP](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-hyper-pink-psp-eng-512-4hp-8991737.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud with OEM Intake Scoop - Hyper Pink | PSP - ENG - 512 - 4HP - JDMuscleRadiator ShroudsperPSP-ENG-512-4HP](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-with-oem-intake-scoop-hyper-pink-psp-eng-512-4hp-3281667.jpg?v=1770327921&width=220)
