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
-
Subaru STI JDM Battery Tie Down WRX 15-21 / STI 15-21 / Scion FR-S 2013-2020 / BRZ 2013-2020 / Toyota GR86 2013-2020 / Forester 2014+ | ST82182ST000
Regular price $189.71Sale price $189.71 Regular priceUnit price per$189.71 -
In StockKartboy 08-21 WRX/STI / 05-09 LGT / 13-21 BRZ 12MM Black Exhaust Hanger Long | KB-011-12mmXL
Regular price $12.00Sale price $12.00 Regular priceUnit price per$12.00 -
Up to $25.50 off
In StockTurbosmart 09-14 WRX / 08-21 STI Internal Wastegate Actuator 7psi Black | TS-0605-1072
Only 11 leftRegular price $229.49Sale price $229.49 Regular priceUnit price per$254.99 -
Up to $45.50 off
In StockTurbosmart 02-07 WRX / 04-21 STI / 06-08 FXT Dual Port Blow Off Valve Black | TS-0205-1016
Only 6 leftRegular price $409.49Sale price $409.49 Regular priceUnit price per$454.99 -
MAPerformance 4-1 Equal Length Header Subaru STI 2004-2020 | SUB-ELH-REV2-PARENT
Regular price From $1,199.99Sale price From $1,199.99 Regular priceUnit price per -
![Torque Solution [02-14 WRX, 07-20 STI, 08-12 LGT, 06-13 FXT] Top Feed Fuel Rails Black](//jdmuscleusa.com/cdn/shop/files/TS-SU-400BK.2-2.jpg?v=1784900856&width=220)
![Torque Solution [02-14 WRX, 07-20 STI, 08-12 LGT, 06-13 FXT] Top Feed Fuel Rails Black](//jdmuscleusa.com/cdn/shop/files/TS-SU-400BK.2-3.jpg?v=1784900856&width=220)
Up to $38.21 off
In StockTorque Solution Top Feed Fuel Rails Black
Fits: 02-14 WRX, 07-20 STI, 08-12 LGT, 06-13 FXT
Only 5 leftRegular price $184.00Sale price $184.00 Regular priceUnit price per$222.21 -
Moroso Coolant Expansion Tank WRX 2008-2020 / STI 2008-2020 | 63871
Regular price $225.99Sale price $225.99 Regular priceUnit price per$225.99 -
Up to $4 off
In StockRadium Subaru Fuel Filter Mount WRX 15-21 / STI 15-21 / Impreza 2008-2014 / Forester XT 2008-2014 | 20-0605
Only 6 leftRegular price $75.95Sale price $75.95 Regular priceUnit price per$79.95 -
aFe Takeda Momentum Pro Dry S Cold Air Intake System WRX 2018-21 / STI 2018-21 | 56-70014D
Regular price $420.00Sale price $420.00 Regular priceUnit price per$420.00 -
![MBRP [15-21 WRX/STI] Armor Pro Series Axle Back w/ Stainless Steel Tips | S4801304](//jdmuscleusa.com/cdn/shop/products/mbrp-15-19-subaru-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-tips-t304-mbrp-mbrps4801304-3.jpg?v=1644305914&width=220)
![MBRP [15-21 WRX/STI] Armor Pro Series Axle Back w/ Stainless Steel Tips | S4801304](//jdmuscleusa.com/cdn/shop/products/mbrp-15-19-subaru-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-tips-t304-mbrp-mbrps4801304.png?v=1644305914&width=220)
Up to $92.94 off
In StockMBRP Armor Pro Series Axle Back w/ Stainless Steel Tips | S4801304
Fits: 15-21 WRX/STI
Regular price $394.99Sale price $394.99 Regular priceUnit price per$487.93 -
In StockCOBB Delrin Oil Cap Most Subaru Models
Only 8 leftRegular price $97.00Sale price $97.00 Regular priceUnit price per$97.00 -
![Cobb [08 - 21 STI/WRX, 09 - 10 Impreza 2.5GT] Coolant Overflow Tank - JDMuscleOverflow / Expansion Tankscobb800650](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-stiwrx-09-10-impreza-25gt-coolant-overflow-tank-5219125.jpg?v=1775590688&width=220)
![Cobb [08 - 21 STI/WRX, 09 - 10 Impreza 2.5GT] Coolant Overflow Tank - JDMuscleOverflow / Expansion Tankscobb800650](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-stiwrx-09-10-impreza-25gt-coolant-overflow-tank-7229131.jpg?v=1775590688&width=220)
Cobb Coolant Overflow Tank
Fits: 08-21 STI/WRX, 09-10 Impreza 2.5GT
Regular price $182.00Sale price $182.00 Regular priceUnit price per$182.00 -
In StockCOBB Fuel Rails Black
Fits: 08-21 STI
Regular price $300.00Sale price $300.00 Regular priceUnit price per$300.00 -
In StockCOBB Fuel Rail Line Kit
Fits: 08-21 STI
Only 20 leftRegular price $595.00Sale price $595.00 Regular priceUnit price per$595.00 -
In StockCOBB Aluminum Alternator Cover Wrinkle Black
Fits: 08-14 WRX, 08-21 STI
Only 10 leftRegular price $106.00Sale price $106.00 Regular priceUnit price per$106.00 -
![Cobb [15 - 21 WRX/STI] Cat Back Exhaust Stainless Steel - JDMuscleCat Back Exhaust Systemcobb515132](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-cat-back-exhaust-stainless-steel-7124872.jpg?v=1775590692&width=220)
![Cobb [15 - 21 WRX/STI] Cat Back Exhaust Stainless Steel - JDMuscleCat Back Exhaust Systemcobb515132](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-cat-back-exhaust-stainless-steel-9821707.jpg?v=1775590692&width=220)
Cobb Cat Back Exhaust Stainless Steel
Fits: 15-21 WRX/STI
Regular price $1,475.00Sale price $1,475.00 Regular priceUnit price per$1,475.00
![Torque Solution [02-14 WRX, 07-20 STI, 08-12 LGT, 06-13 FXT] Top Feed Fuel Rails Black](http://jdmuscleusa.com/cdn/shop/files/TS-SU-400BK.2-2.jpg?v=1784900856&width=220)
![Torque Solution [02-14 WRX, 07-20 STI, 08-12 LGT, 06-13 FXT] Top Feed Fuel Rails Black](http://jdmuscleusa.com/cdn/shop/files/TS-SU-400BK.2-3.jpg?v=1784900856&width=220)
![MBRP [15-21 WRX/STI] Armor Pro Series Axle Back w/ Stainless Steel Tips | S4801304](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-19-subaru-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-tips-t304-mbrp-mbrps4801304-3.jpg?v=1644305914&width=220)
![MBRP [15-21 WRX/STI] Armor Pro Series Axle Back w/ Stainless Steel Tips | S4801304](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-19-subaru-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-tips-t304-mbrp-mbrps4801304.png?v=1644305914&width=220)
![Cobb [08 - 21 STI/WRX, 09 - 10 Impreza 2.5GT] Coolant Overflow Tank - JDMuscleOverflow / Expansion Tankscobb800650](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-stiwrx-09-10-impreza-25gt-coolant-overflow-tank-5219125.jpg?v=1775590688&width=220)
![Cobb [08 - 21 STI/WRX, 09 - 10 Impreza 2.5GT] Coolant Overflow Tank - JDMuscleOverflow / Expansion Tankscobb800650](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-stiwrx-09-10-impreza-25gt-coolant-overflow-tank-7229131.jpg?v=1775590688&width=220)
![Cobb [15 - 21 WRX/STI] Cat Back Exhaust Stainless Steel - JDMuscleCat Back Exhaust Systemcobb515132](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-cat-back-exhaust-stainless-steel-7124872.jpg?v=1775590692&width=220)
![Cobb [15 - 21 WRX/STI] Cat Back Exhaust Stainless Steel - JDMuscleCat Back Exhaust Systemcobb515132](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-cat-back-exhaust-stainless-steel-9821707.jpg?v=1775590692&width=220)