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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In StockOVERTAKE Battery Tie Down - Subaru Models
Regular price $60.00Sale price $60.00 Regular priceUnit price per$60.00 -
In StockFel-Pro Multi-Purpose O-Ring Part Number fel36024
Fits: 13+ FRS/BRZ/86, 13-21 WRX STI, 15-21 WRX
Only 2 leftRegular price $13.00Sale price $13.00 Regular priceUnit price per$13.00 -
![Cobb [11 - 21 WRX/STI GV/VA Sedan] Catback Exhaust - JDMuscleCat Back Exhaust Systemcobb515160](//jdmuscleusa.com/cdn/shop/files/cobb-11-21-wrxsti-gvva-sedan-catback-exhaust-8488896.jpg?v=1770325030&width=220)
![Cobb [11 - 21 WRX/STI GV/VA Sedan] Catback Exhaust - JDMuscleCat Back Exhaust Systemcobb515160](//jdmuscleusa.com/cdn/shop/files/cobb-11-21-wrxsti-gvva-sedan-catback-exhaust-1959005.jpg?v=1770325031&width=220)
Cobb Catback Exhaust
Fits: 11-21 WRX/STI GV/VA Sedan
Regular price $1,565.00Sale price $1,565.00 Regular priceUnit price per$1,565.00 -
IAG Performance Adjustable EJ20/EJ25 Timing Idler Kit Subaru Models
Regular price $199.99Sale price $199.99 Regular priceUnit price per$199.99 -
IAG Performance 76mm Throttle Body Adapter for Multiple Subaru Fitments
Regular price $119.99Sale price $119.99 Regular priceUnit price per$119.99 -
IAG Performance Turbo Blanket Heat Shield Subaru T3 Turbo Models
Regular price $119.99Sale price $119.99 Regular priceUnit price per$119.99 -
In StockCobb Tip Kit - Blued Titanium
Fits: 11-14 WRX, 11-21 STI
Only 3 leftRegular price $280.00Sale price $280.00 Regular priceUnit price per$280.00 -
In StockCobb Tip Kit - Brushed Titanium
Fits: 11-14 WRX, 11-21 STI
Only 5 leftRegular price $280.00Sale price $280.00 Regular priceUnit price per$280.00 -
![Cobb [15 - 21 WRX/STI] AccessPORT V3 - JDMuscleTunecobbAP3-AU-SUB-004](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-accessport-v3-1913911.jpg?v=1772960829&width=220)
![Cobb [15 - 21 WRX/STI] AccessPORT V3 - JDMuscleTunecobbAP3-AU-SUB-004](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-accessport-v3-1205846.jpg?v=1772960830&width=220)
Up to $4 offCobb AccessPORT V3
Fits: 15-21 WRX/STI
Regular price $766.00Sale price $766.00 Regular priceUnit price per$770.00 -
![COBB [inc. 02+ WRX] Battery Tie Down Black Subaru Models - JDMuscleBattery Tie Downs and TraysCOB800160-BK](//jdmuscleusa.com/cdn/shop/files/cobb-inc-02-wrx-battery-tie-down-black-subaru-models-7339211.jpg?v=1772957468&width=220)
![COBB [inc. 02+ WRX] Battery Tie Down Black Subaru Models - JDMuscleBattery Tie Downs and TraysCOB800160-BK](//jdmuscleusa.com/cdn/shop/files/cobb-inc-02-wrx-battery-tie-down-black-subaru-models-8884474.jpg?v=1772957468&width=220)
COBB Battery Tie Down Black Subaru Models
Fits: inc. 02+ WRX
Regular price $70.00Sale price $70.00 Regular priceUnit price per$70.00 -
IAG / Crest CNC Billet Aluminum EJ25 Subaru Case Halves for Subaru Multiple Fitments
Regular price $11,789.99Sale price $11,789.99 Regular priceUnit price per$11,549.99 -
![IAG [18 - 19 STI, 18 STi Type RA] Stage 1 Cylinder Head Package - JDMuscleCylinder Heads & Valvetrain ComponentsIAG-ENG-H550NENo Cams / Lifters Included](//jdmuscleusa.com/cdn/shop/files/iag-18-19-sti-18-sti-type-ra-stage-1-cylinder-head-package-9482150.jpg?v=1772964128&width=220)
![IAG [18 - 19 STI, 18 STi Type RA] Stage 1 Cylinder Head Package - JDMuscleCylinder Heads & Valvetrain ComponentsIAG-ENG-H550NENo Cams / Lifters Included](//jdmuscleusa.com/cdn/shop/products/iag-18-19-sti-18-sti-type-ra-stage-1-cylinder-head-package-6338798.jpg?v=1772964129&width=220)
Up to $460 offIAG Stage 1 Cylinder Head Package
Fits: 18-19 STI, 18 STi Type RA
Regular price From $4,599.99Sale price From $4,599.99 Regular priceUnit price per$4,599.99 -
IAG Performance Turbo Heat Shield for T4 Size Turbos
Regular price $129.99Sale price $129.99 Regular priceUnit price per$129.99 -
IAG Performance 1st-4th Straight Cut Gear Set
Fits: 04-21 WRX STI
Regular price $6,999.99Sale price $6,999.99 Regular priceUnit price per$6,999.99 -
![IAG [08 - 19 STI] PTFE Flex Fuel System Kit w/ 1050cc Injectors - JDMuscleFuel System PackagesIAG-AFD-2310BKBlack Fuel Rails](//jdmuscleusa.com/cdn/shop/products/iag-08-19-sti-ptfe-flex-fuel-system-kit-w-1050cc-injectors-8820525.jpg?v=1772964128&width=220)
![IAG [08 - 19 STI] PTFE Flex Fuel System Kit w/ 1050cc Injectors - JDMuscleFuel System PackagesIAG-AFD-2310GDGold Fuel Rails](//jdmuscleusa.com/cdn/shop/products/iag-08-19-sti-ptfe-flex-fuel-system-kit-w-1050cc-injectors-7960607.jpg?v=1772964129&width=220)
IAG PTFE Flex Fuel System Kit w/ 1050cc Injectors
Fits: 08-19 STI
Regular price $1,799.99Sale price $1,799.99 Regular priceUnit price per$1,679.99 -
IAG Wrist Pin / Cover Seal Kit for Subaru Multiple Fitments
Regular price $149.99Sale price $149.99 Regular priceUnit price per$149.99
![Cobb [11 - 21 WRX/STI GV/VA Sedan] Catback Exhaust - JDMuscleCat Back Exhaust Systemcobb515160](http://jdmuscleusa.com/cdn/shop/files/cobb-11-21-wrxsti-gvva-sedan-catback-exhaust-8488896.jpg?v=1770325030&width=220)
![Cobb [11 - 21 WRX/STI GV/VA Sedan] Catback Exhaust - JDMuscleCat Back Exhaust Systemcobb515160](http://jdmuscleusa.com/cdn/shop/files/cobb-11-21-wrxsti-gvva-sedan-catback-exhaust-1959005.jpg?v=1770325031&width=220)
![Cobb [15 - 21 WRX/STI] AccessPORT V3 - JDMuscleTunecobbAP3-AU-SUB-004](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-accessport-v3-1913911.jpg?v=1772960829&width=220)
![Cobb [15 - 21 WRX/STI] AccessPORT V3 - JDMuscleTunecobbAP3-AU-SUB-004](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-accessport-v3-1205846.jpg?v=1772960830&width=220)
![COBB [inc. 02+ WRX] Battery Tie Down Black Subaru Models - JDMuscleBattery Tie Downs and TraysCOB800160-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-inc-02-wrx-battery-tie-down-black-subaru-models-7339211.jpg?v=1772957468&width=220)
![COBB [inc. 02+ WRX] Battery Tie Down Black Subaru Models - JDMuscleBattery Tie Downs and TraysCOB800160-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-inc-02-wrx-battery-tie-down-black-subaru-models-8884474.jpg?v=1772957468&width=220)
![IAG [18 - 19 STI, 18 STi Type RA] Stage 1 Cylinder Head Package - JDMuscleCylinder Heads & Valvetrain ComponentsIAG-ENG-H550NENo Cams / Lifters Included](http://jdmuscleusa.com/cdn/shop/files/iag-18-19-sti-18-sti-type-ra-stage-1-cylinder-head-package-9482150.jpg?v=1772964128&width=220)
![IAG [18 - 19 STI, 18 STi Type RA] Stage 1 Cylinder Head Package - JDMuscleCylinder Heads & Valvetrain ComponentsIAG-ENG-H550NENo Cams / Lifters Included](http://jdmuscleusa.com/cdn/shop/products/iag-18-19-sti-18-sti-type-ra-stage-1-cylinder-head-package-6338798.jpg?v=1772964129&width=220)
![IAG [08 - 19 STI] PTFE Flex Fuel System Kit w/ 1050cc Injectors - JDMuscleFuel System PackagesIAG-AFD-2310BKBlack Fuel Rails](http://jdmuscleusa.com/cdn/shop/products/iag-08-19-sti-ptfe-flex-fuel-system-kit-w-1050cc-injectors-8820525.jpg?v=1772964128&width=220)
![IAG [08 - 19 STI] PTFE Flex Fuel System Kit w/ 1050cc Injectors - JDMuscleFuel System PackagesIAG-AFD-2310GDGold Fuel Rails](http://jdmuscleusa.com/cdn/shop/products/iag-08-19-sti-ptfe-flex-fuel-system-kit-w-1050cc-injectors-7960607.jpg?v=1772964129&width=220)
