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 StockRemark Mid Pipe Kit Resonated | RO-CPVA-C
Fits: 15-21 WRX/STI
Only 6 leftRegular price $855.00Sale price $855.00 Regular priceUnit price per$855.00 -
![PLM [15-21 WRX STI] Power Driven 3" Non Resonated Mid Pipe | PLM-SUB-MID-2015-NON-RES](//jdmuscleusa.com/cdn/shop/products/PLM-SUB-MID-2015-NON-2T.jpg?v=1748367027&width=220)
Up to $100 offPLM Power Driven 3" Non Resonated Mid Pipe | PLM-SUB-MID-2015-NON-RES
Fits: 15-21 WRX STI
Regular price $495.00Sale price $495.00 Regular priceUnit price per$595.00 -
![COBB Subaru Redline Fuse Cover [08 - 21 WRX/STI, 2019 S209, 2018 Type RA] - JDMuscleFuse Box CoversCOB844660](//jdmuscleusa.com/cdn/shop/products/cobb-subaru-redline-fuse-cover-08-21-wrxsti-2019-s209-2018-type-ra-2604858.jpg?v=1770330019&width=220)
![COBB Subaru Redline Fuse Cover [08 - 21 WRX/STI, 2019 S209, 2018 Type RA] - JDMuscleFuse Box CoversCOB844660](//jdmuscleusa.com/cdn/shop/products/cobb-subaru-redline-fuse-cover-08-21-wrxsti-2019-s209-2018-type-ra-6909168.jpg?v=1770330019&width=220)
In StockCOBB Subaru Redline Fuse Cover
Fits: 08-21 WRX/STI, 19 S209, 18 Type RA
Only 13 leftRegular price $207.00Sale price $207.00 Regular priceUnit price per$207.00 -
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 LGT, 05 - 09 OBXT, 09 - 13 FXT] V3 Air / Oil Separator - AOS - JDMuscleAir Oil Separatorscobb822615](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-lgt-05-09-obxt-09-13-fxt-v3-air-oil-separator-aos-1666996.jpg?v=1770336429&width=220)
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 LGT, 05 - 09 OBXT, 09 - 13 FXT] V3 Air / Oil Separator - AOS - JDMuscleAir Oil Separatorscobb822615](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-lgt-05-09-obxt-09-13-fxt-v3-air-oil-separator-aos-3273984.jpg?v=1770336430&width=220)
In StockCOBB V3 Air / Oil Separator - AOS
Fits: 08-14 WRX, 08-21 STI, 05-09 LGT, 05-09 OBXT, 09-13 FXT
Regular price $595.00Sale price $595.00 Regular priceUnit price per$595.00 -
![FactionFab [15-21 WRX/STI] Axle Back Exhaust Burnt Tip - Final Sale - JDMuscleAxle Back ExhaustsFFA1.10204.2](//jdmuscleusa.com/cdn/shop/products/factionfab-15-21-wrxsti-axle-back-exhaust-burnt-tip-final-sale-9310562.jpg?v=1781014102&width=220)
![FactionFab [15-21 WRX/STI] Axle Back Exhaust Burnt Tip - Final Sale - JDMuscleAxle Back ExhaustsFFA1.10204.2](//jdmuscleusa.com/cdn/shop/products/factionfab-15-21-wrxsti-axle-back-exhaust-burnt-tip-final-sale-7812463.jpg?v=1781014102&width=220)
FactionFab Axle Back Exhaust Burnt Tip - Final Sale
Fits: 15-21 WRX/STI
Regular price $476.40Sale price $476.40 Regular priceUnit price per$430.00 -
![GrimmSpeed [15-21 STI] StealthBox Cold Air Intake Red | 060078](//jdmuscleusa.com/cdn/shop/products/grm060078.jpg?v=1667333829&width=220)
![GrimmSpeed [15-21 STI] StealthBox Cold Air Intake Red | 060078](//jdmuscleusa.com/cdn/shop/products/grimmspeed-stealthbox-cold-air-intake-red-subaru-sti-2015-2020-060078-cold-air-intakes-grimmspeed-grm060078.jpg?v=1667292846&width=220)
GrimmSpeed StealthBox Cold Air Intake Red | 060078
Fits: 15-21 STI
Regular price $484.00Sale price $484.00 Regular priceUnit price per$484.00 -
In StockGrimmSpeed Head to Exhaust Manifold Gaskets | Pair Suabru Turbo Models | 020001
Only 2 leftRegular price $40.00Sale price $40.00 Regular priceUnit price per$40.00 -
Up to $50 off
In StockPLM Axle-Back Exhaust / Muffler Deletes V1 Poish / Titanium Tip
Fits: 15-21 WRX/STI
Only 8 leftRegular price From $349.00Sale price From $349.00 Regular priceUnit price per$350.00 -
Up to $35 offPerrin Upper Radiator Bracket Set Red | PSP-ENG-521
Fits: 08-21 WRX/STI
Regular price From $47.00Sale price From $47.00 Regular priceUnit price per$82.00 -
EOS 15-21 WRX / STi Muffler Delete Axle Back 4 Inch Quad Tips Exhaust
Regular price $290.00Sale price $290.00 Regular priceUnit price per$249.98 -
![COBB [08 - 14 WRX, 08 - 21 STI] Silicone Radiator Hose Kit Black - JDMuscleRadiator HosescobbB22400-BK](//jdmuscleusa.com/cdn/shop/files/cobb-08-14-wrx-08-21-sti-silicone-radiator-hose-kit-black-5125754.jpg?v=1770328028&width=220)
In StockCOBB Silicone Radiator Hose Kit Black
Fits: 08-14 WRX, 08-21 STI
Regular price $121.00Sale price $121.00 Regular priceUnit price per$121.00 -
![Mishimoto [08 - 21 WRX/STI] Aluminum Coolant Overflow Tank - Polished | MMRT - STI - 08 - JDMuscleOverflow Tanks / Coolant Tank and AccessoriesMIMMRT-STI-08](//jdmuscleusa.com/cdn/shop/products/mishimoto-08-21-wrxsti-aluminum-coolant-overflow-tank-polished-mmrt-sti-08-8574580.png?v=1770329185&width=220)
![Mishimoto [08 - 21 WRX/STI] Aluminum Coolant Overflow Tank - Polished | MMRT - STI - 08 - JDMuscleOverflow Tanks / Coolant Tank and AccessoriesMIMMRT-STI-08](//jdmuscleusa.com/cdn/shop/products/mishimoto-08-21-wrxsti-aluminum-coolant-overflow-tank-polished-mmrt-sti-08-6197822.png?v=1770329185&width=220)
Up to $23.05 off
In StockMishimoto Aluminum Coolant Overflow Tank - Polished
Fits: 08-21 WRX/STI
Only 3 leftRegular price $233.95Sale price $233.95 Regular priceUnit price per$257.00 -
![Cobb [15 - 21 WRX/STI] Coolant Overflow Tank - JDMuscleOverflow Tanks / Coolant Tank and Accessoriescobb800660](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-coolant-overflow-tank-5416779.jpg?v=1770330618&width=220)
![Cobb [15 - 21 WRX/STI] Coolant Overflow Tank - JDMuscleOverflow Tanks / Coolant Tank and Accessoriescobb800660](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-coolant-overflow-tank-5682329.jpg?v=1770330619&width=220)
In StockCobb Coolant Overflow Tank
Fits: 15-21 WRX/STI
Only 19 leftRegular price $290.00Sale price $290.00 Regular priceUnit price per$290.00 -
![AWE Tuning [11-25 WRX Sedan/11-21 STI Sedan] Touring to Track Conversion Axle Back Exhaust | 3820-41004](//jdmuscleusa.com/cdn/shop/products/c7xclplofsw0rx4iuhll.jpg?v=1645861110&width=220)
Up to $20.79 off
In StockAWE Tuning Touring to Track Conversion Axle Back Exhaust
Fits: 11-25 WRX Sedan, 11-21 STI Sedan
Only 3 leftRegular price $395.00Sale price $395.00 Regular priceUnit price per$415.79 -
Cobb 12mm Urethane Exhaust Hanger
Fits: 08-25 WRX/STI
Regular price $25.00Sale price $25.00 Regular priceUnit price per$25.00 -
![Cobb [02 - 07 WRX, 04 - 21 STI] TD05H - 20G - 8 Turbocharger | E1120G - JDMuscleTurboscobbE1120G](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-td05h-20g-8-turbocharger-e1120g-6497348.jpg?v=1770336435&width=220)
![Cobb [02 - 07 WRX, 04 - 21 STI] TD05H - 20G - 8 Turbocharger | E1120G - JDMuscleTurboscobbE1120G](//jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-td05h-20g-8-turbocharger-e1120g-3149936.jpg?v=1770336436&width=220)
In StockCobb TD05H-20G-8 Turbocharger
Fits: 02-07 WRX, 04-21 STI
Regular price $1,470.00Sale price $1,470.00 Regular priceUnit price per$1,470.00
![PLM [15-21 WRX STI] Power Driven 3" Non Resonated Mid Pipe | PLM-SUB-MID-2015-NON-RES](http://jdmuscleusa.com/cdn/shop/products/PLM-SUB-MID-2015-NON-2T.jpg?v=1748367027&width=220)
![COBB Subaru Redline Fuse Cover [08 - 21 WRX/STI, 2019 S209, 2018 Type RA] - JDMuscleFuse Box CoversCOB844660](http://jdmuscleusa.com/cdn/shop/products/cobb-subaru-redline-fuse-cover-08-21-wrxsti-2019-s209-2018-type-ra-2604858.jpg?v=1770330019&width=220)
![COBB Subaru Redline Fuse Cover [08 - 21 WRX/STI, 2019 S209, 2018 Type RA] - JDMuscleFuse Box CoversCOB844660](http://jdmuscleusa.com/cdn/shop/products/cobb-subaru-redline-fuse-cover-08-21-wrxsti-2019-s209-2018-type-ra-6909168.jpg?v=1770330019&width=220)
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 LGT, 05 - 09 OBXT, 09 - 13 FXT] V3 Air / Oil Separator - AOS - JDMuscleAir Oil Separatorscobb822615](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-lgt-05-09-obxt-09-13-fxt-v3-air-oil-separator-aos-1666996.jpg?v=1770336429&width=220)
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 LGT, 05 - 09 OBXT, 09 - 13 FXT] V3 Air / Oil Separator - AOS - JDMuscleAir Oil Separatorscobb822615](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-lgt-05-09-obxt-09-13-fxt-v3-air-oil-separator-aos-3273984.jpg?v=1770336430&width=220)
![FactionFab [15-21 WRX/STI] Axle Back Exhaust Burnt Tip - Final Sale - JDMuscleAxle Back ExhaustsFFA1.10204.2](http://jdmuscleusa.com/cdn/shop/products/factionfab-15-21-wrxsti-axle-back-exhaust-burnt-tip-final-sale-9310562.jpg?v=1781014102&width=220)
![FactionFab [15-21 WRX/STI] Axle Back Exhaust Burnt Tip - Final Sale - JDMuscleAxle Back ExhaustsFFA1.10204.2](http://jdmuscleusa.com/cdn/shop/products/factionfab-15-21-wrxsti-axle-back-exhaust-burnt-tip-final-sale-7812463.jpg?v=1781014102&width=220)
![GrimmSpeed [15-21 STI] StealthBox Cold Air Intake Red | 060078](http://jdmuscleusa.com/cdn/shop/products/grm060078.jpg?v=1667333829&width=220)
![GrimmSpeed [15-21 STI] StealthBox Cold Air Intake Red | 060078](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-stealthbox-cold-air-intake-red-subaru-sti-2015-2020-060078-cold-air-intakes-grimmspeed-grm060078.jpg?v=1667292846&width=220)
![COBB [08 - 14 WRX, 08 - 21 STI] Silicone Radiator Hose Kit Black - JDMuscleRadiator HosescobbB22400-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-08-14-wrx-08-21-sti-silicone-radiator-hose-kit-black-5125754.jpg?v=1770328028&width=220)
![Mishimoto [08 - 21 WRX/STI] Aluminum Coolant Overflow Tank - Polished | MMRT - STI - 08 - JDMuscleOverflow Tanks / Coolant Tank and AccessoriesMIMMRT-STI-08](http://jdmuscleusa.com/cdn/shop/products/mishimoto-08-21-wrxsti-aluminum-coolant-overflow-tank-polished-mmrt-sti-08-8574580.png?v=1770329185&width=220)
![Mishimoto [08 - 21 WRX/STI] Aluminum Coolant Overflow Tank - Polished | MMRT - STI - 08 - JDMuscleOverflow Tanks / Coolant Tank and AccessoriesMIMMRT-STI-08](http://jdmuscleusa.com/cdn/shop/products/mishimoto-08-21-wrxsti-aluminum-coolant-overflow-tank-polished-mmrt-sti-08-6197822.png?v=1770329185&width=220)
![Cobb [15 - 21 WRX/STI] Coolant Overflow Tank - JDMuscleOverflow Tanks / Coolant Tank and Accessoriescobb800660](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-coolant-overflow-tank-5416779.jpg?v=1770330618&width=220)
![Cobb [15 - 21 WRX/STI] Coolant Overflow Tank - JDMuscleOverflow Tanks / Coolant Tank and Accessoriescobb800660](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-coolant-overflow-tank-5682329.jpg?v=1770330619&width=220)
![AWE Tuning [11-25 WRX Sedan/11-21 STI Sedan] Touring to Track Conversion Axle Back Exhaust | 3820-41004](http://jdmuscleusa.com/cdn/shop/products/c7xclplofsw0rx4iuhll.jpg?v=1645861110&width=220)
![Cobb [02 - 07 WRX, 04 - 21 STI] TD05H - 20G - 8 Turbocharger | E1120G - JDMuscleTurboscobbE1120G](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-td05h-20g-8-turbocharger-e1120g-6497348.jpg?v=1770336435&width=220)
![Cobb [02 - 07 WRX, 04 - 21 STI] TD05H - 20G - 8 Turbocharger | E1120G - JDMuscleTurboscobbE1120G](http://jdmuscleusa.com/cdn/shop/products/cobb-02-07-wrx-04-21-sti-td05h-20g-8-turbocharger-e1120g-3149936.jpg?v=1770336436&width=220)