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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![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](//jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-3642986.png?v=1770329895&width=220)
![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](//jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-9137942.png?v=1770329896&width=220)
Up to $133.05 offMishimoto Stainless Steel Cat Back Exhaust | MMEXH-WRX-15
Fits: 15-21 WRX/STI
Regular price $1,326.95Sale price $1,326.95 Regular priceUnit price per$1,460.00 -
Killer B Motorsport High Flow Water Pump Housing V2 Subaru Models | inc. 2002-2014 WRX/ 2004-2020 STI | WPHV2
Regular price $233.00Sale price $233.00 Regular priceUnit price per$233.00 -
IAG Performance 02-14 WRX / 04-21 STI / 05-09 LGT / 04-13 FXT Oil Control Baffle / Windage Tray Combo | IAG-ENG-2087
Regular price From $199.99Sale price From $199.99 Regular priceUnit price per$199.99 -
Up to $20 offIAG Garret GT Series Turbo Oil Feed Line & AVCS Line for Subaru Multiple Fitments
Regular price From $119.99Sale price From $119.99 Regular priceUnit price per$136.36 -
IAG Stage 2 2.5L Subaru Short Block for Subaru Multiple Fitments
Regular price $4,955.41Sale price $4,955.41 Regular priceUnit price per$3,925.98 -
IAG Stock Location Turbo Oil Feed Line & AVCS Line for Multiple Fitments
Regular price From $119.99Sale price From $119.99 Regular priceUnit price per$116.36 -
Torque Solution TMIC Stud Kit WRX 2002-2007 / STI 2004-21 | TS-SU-TSK
Regular price $18.00Sale price $18.00 Regular priceUnit price per$18.00 -
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Hanger Plumbing Kit w/ Stainless Filter - JDMuscleFuel System Kitsrad20-0629-03](//jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-hanger-plumbing-kit-w-stainless-filter-4925571.jpg?v=1781013619&width=220)
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Hanger Plumbing Kit w/ Stainless Filter - JDMuscleFuel System Kitsrad20-0629-03](//jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-hanger-plumbing-kit-w-stainless-filter-8152250.jpg?v=1781013618&width=220)
Up to $25 off
In StockRadium Engineering V2 Fuel Hanger Plumbing Kit w/ Stainless Filter
Fits: 08-21 WRX/STI, 05-09 LGT
Only 6 leftRegular price $474.95Sale price $474.95 Regular priceUnit price per$499.95 -
![CSF [08–21 WRX/STI, 08–16 Impreza, 16–17 Crosstrek, 09–13 Forester, 05–09 Legacy/Outback] 2-Row 42mm High-Performance Aluminum Radiator | 7095 - JDMuscleRadiatorscsf7095](//jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-08-16-impreza-16-17-crosstrek-09-13-forester-05-09-legacyoutback-2-row-42mm-high-performance-aluminum-radiator-7095-1693486.jpg?v=1781013731&width=220)
![CSF [08–21 WRX/STI, 08–16 Impreza, 16–17 Crosstrek, 09–13 Forester, 05–09 Legacy/Outback] 2-Row 42mm High-Performance Aluminum Radiator | 7095 - JDMuscleRadiatorscsf7095](//jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-08-16-impreza-16-17-crosstrek-09-13-forester-05-09-legacyoutback-2-row-42mm-high-performance-aluminum-radiator-7095-2750273.jpg?v=1781013731&width=220)
Up to $24 off
In StockCSF 2-Row 42mm High-Performance Aluminum Radiator | 7095
Fits: 08–21 WRX/STI, 08–16 Impreza, 16–17 Crosstrek, 09–13 Forester, 05–09 Legacy/Outback
Only 18 leftRegular price $485.00Sale price $485.00 Regular priceUnit price per$509.00 -
![Cobb [15 - 18 STI] SF Air Intake Box - JDMuscleAir Boxescobb715160](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-air-intake-box-6970489.jpg?v=1770336370&width=220)
![Cobb [15 - 18 STI] SF Air Intake Box - JDMuscleAir Boxescobb715160](//jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-air-intake-box-8990763.jpg?v=1770336371&width=220)
In StockCobb SF Air Intake Box
Fits: 15-18 STI
Only 18 leftRegular price $260.00Sale price $260.00 Regular priceUnit price per$260.00 -
In StockCobb Turbo Blanket Subaru EJ Stock
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Only 20 leftRegular price $198.00Sale price $198.00 Regular priceUnit price per$198.00 -
In StockCOBB Front Mount Intercooler Kit Black
Fits: 15-21 STI
Only 7 leftRegular price $2,435.00Sale price $2,435.00 Regular priceUnit price per$2,435.00 -
In StockCOBB Fuel System Upgrade Package
Fits: 08-21 STI
Only 17 leftRegular price $1,903.00Sale price $1,903.00 Regular priceUnit price per$1,903.00 -
![Cobb [06 - 14 WRX, 04 - 21 STI, 06 - 09 Legacy GT/Outback XT, 06 - 13 Forester XT] 2in Up Pipe - JDMuscleTurbo Uppipescobb512260](//jdmuscleusa.com/cdn/shop/products/cobb-06-14-wrx-04-21-sti-06-09-legacy-gtoutback-xt-06-13-forester-xt-2in-up-pipe-5151324.jpg?v=1775590815&width=220)
Cobb 2in Up Pipe
Fits: 06-14 WRX, 04-21 STI, 06-09 Legacy GT/Outback XT, 06-13 Forester XT
Regular price $256.00Sale price $256.00 Regular priceUnit price per$256.00 -
In StockCOBB Fuel Rails / Line Kit Package
Fits: 08-21 STI
Only 20 leftRegular price $808.00Sale price $808.00 Regular priceUnit price per$808.00 -
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](//jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-1209747.jpg?v=1770336437&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](//jdmuscleusa.com/cdn/shop/files/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-5283363.jpg?v=1770336437&width=220)
In StockCOBB SF Intake + Airbox Combo-Black/Blue
Fits: 19-21 STI, 18 STI Type RA
Regular price $575.00Sale price $575.00 Regular priceUnit price per$575.00
![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](http://jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-3642986.png?v=1770329895&width=220)
![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](http://jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-9137942.png?v=1770329896&width=220)
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Hanger Plumbing Kit w/ Stainless Filter - JDMuscleFuel System Kitsrad20-0629-03](http://jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-hanger-plumbing-kit-w-stainless-filter-4925571.jpg?v=1781013619&width=220)
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Hanger Plumbing Kit w/ Stainless Filter - JDMuscleFuel System Kitsrad20-0629-03](http://jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-hanger-plumbing-kit-w-stainless-filter-8152250.jpg?v=1781013618&width=220)
![CSF [08–21 WRX/STI, 08–16 Impreza, 16–17 Crosstrek, 09–13 Forester, 05–09 Legacy/Outback] 2-Row 42mm High-Performance Aluminum Radiator | 7095 - JDMuscleRadiatorscsf7095](http://jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-08-16-impreza-16-17-crosstrek-09-13-forester-05-09-legacyoutback-2-row-42mm-high-performance-aluminum-radiator-7095-1693486.jpg?v=1781013731&width=220)
![CSF [08–21 WRX/STI, 08–16 Impreza, 16–17 Crosstrek, 09–13 Forester, 05–09 Legacy/Outback] 2-Row 42mm High-Performance Aluminum Radiator | 7095 - JDMuscleRadiatorscsf7095](http://jdmuscleusa.com/cdn/shop/products/csf-08-21-wrxsti-08-16-impreza-16-17-crosstrek-09-13-forester-05-09-legacyoutback-2-row-42mm-high-performance-aluminum-radiator-7095-2750273.jpg?v=1781013731&width=220)
![Cobb [15 - 18 STI] SF Air Intake Box - JDMuscleAir Boxescobb715160](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-air-intake-box-6970489.jpg?v=1770336370&width=220)
![Cobb [15 - 18 STI] SF Air Intake Box - JDMuscleAir Boxescobb715160](http://jdmuscleusa.com/cdn/shop/products/cobb-15-18-sti-sf-air-intake-box-8990763.jpg?v=1770336371&width=220)
![Cobb [06 - 14 WRX, 04 - 21 STI, 06 - 09 Legacy GT/Outback XT, 06 - 13 Forester XT] 2in Up Pipe - JDMuscleTurbo Uppipescobb512260](http://jdmuscleusa.com/cdn/shop/products/cobb-06-14-wrx-04-21-sti-06-09-legacy-gtoutback-xt-06-13-forester-xt-2in-up-pipe-5151324.jpg?v=1775590815&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](http://jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-1209747.jpg?v=1770336437&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](http://jdmuscleusa.com/cdn/shop/files/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-5283363.jpg?v=1770336437&width=220)