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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Up to $22.90 off
In StockTurbosmart Kompact Plumb Back BPV
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 4 leftRegular price $206.09Sale price $206.09 Regular priceUnit price per$228.99 -
Grimmspeed VF Series Internal Wastegate Brackets - Subaru Universal
Regular price $45.00Sale price $45.00 Regular priceUnit price per$45.00 -
Up to $49.75 offPerrin 08-21 STI Electronic Boost Control Solenoid | ASM-TAC-731
Regular price $149.25Sale price $149.25 Regular priceUnit price per$199.00 -
Up to $20 offRadium Engineering Dual Catch Can Kit 2002-2014 WRX / 2004-21 STI / 2004-2013 Forester XT
Regular price $379.95Sale price $379.95 Regular priceUnit price per$399.95 -
![Company23 [08-21 STI] Standard Boost Control Solenoid| 530](//jdmuscleusa.com/cdn/shop/products/company23-standard-boost-control-solenoid-subaru-sti-2008-2020-boost-control-solenoids-company23-cop-530.jpg?v=1614538775&width=220)
Company23 Standard Boost Control Solenoid| 530
Fits: 08-21 STI
Regular price $156.00Sale price $156.00 Regular priceUnit price per$156.00 -
Subaru USDM Thermostat Gasket | 21236aa010
Fits: 02-14 WRX, 04-21 STI
Regular price $3.75Sale price $3.75 Regular priceUnit price per$3.75 -
Up to $15 off
In StockAEM Fuel Pump 340lph - Universal
Regular price $117.95Sale price $117.95 Regular priceUnit price per$132.95 -
In StockWalbro 450lph In-Tank Fuel Pump High Pressure Version | F90000274 - Universal
Regular price From $144.50Sale price From $144.50 Regular priceUnit price per$0.00 -
![Remark [15-21 WRX/STI] SPT Style Axle Back w/ Double Wall Burnt Tips | RO-TTSP-D](//jdmuscleusa.com/cdn/shop/products/remark-axleback-exhaust-titanium-stainless-double-wall-tip-spt-version-subaru-wrx-sti-2015-2019-axle-back-exhausts-remark-ro-ttsp-d.jpg?v=1745512159&width=220)
![Remark [15-21 WRX/STI] SPT Style Axle Back w/ Double Wall Burnt Tips | RO-TTSP-D](//jdmuscleusa.com/cdn/shop/files/remark-spt-style-axle-back-w-double-wall-burnt-tips-2015-2021-wrx-2015-2021-sti-ro-ttsp-d-833272_530x643_556c1068-76d3-48ff-b389-5326ebc48059.jpg?v=1745512159&width=220)
In StockRemark SPT Style Axle Back w/ Double Wall Burnt Tips
Fits: 15-21 WRX/STI
Only 3 leftRegular price $545.00Sale price $545.00 Regular priceUnit price per$545.00 -
In StockRemark Boso Axle Back Exhaust w/ Stainless Steel Single Wall Tip WRX/STI 15-2019
Only 5 leftRegular price $695.00Sale price $695.00 Regular priceUnit price per$695.00 -
FactionFab 08-14 WRX / 08+ STI MAF Sensor Replacement O ring
Regular price $8.40Sale price $8.40 Regular priceUnit price per$7.00 -
In StockInjector Dynamics 02-14 WRX / 07-19 STI Top Feed ID1050X Power Package 1
Regular price From $643.00Sale price From $643.00 Regular priceUnit price per$643.00 -
Grimmspeed 02-07 WRX / 04-21 STI / 04-08 FXT Top Mount Intercooler Y-Pipe Kit Black | 090096
Regular price $245.00Sale price $245.00 Regular priceUnit price per$245.00 -
Up to $11.21 off
In StockTurbo XS Billet Aluminum Radiator Stay - Blue
Fits: 15-21 WRX/STI
Only 12 leftRegular price $41.00Sale price $41.00 Regular priceUnit price per$52.21 -
Up to $4.40 off
In StockBLOX Racing Magnetic Oil Drain Plug - M20x1.50mm
Only 6 leftRegular price $17.60Sale price $17.60 Regular priceUnit price per$22.00 -
![Torque Solution [02-25 WRX, 04-21 STI] V3 Billet Pitch Stop Engine Mount | TS-SU-011](//jdmuscleusa.com/cdn/shop/products/torque-solution-v3-billet-pitch-stop-engine-mount-subaru-wrx-2002-2014-sti-2004-2019-engine-mounts-torque-solution-black-tqsts-su-011.jpg?v=1614518869&width=220)
![Torque Solution [02-25 WRX, 04-21 STI] V3 Billet Pitch Stop Engine Mount | TS-SU-011](//jdmuscleusa.com/cdn/shop/products/torque-solution-v3-billet-pitch-stop-engine-mount-subaru-wrx-2002-2014-sti-2004-2019-engine-mounts-torque-solution-2.jpg?v=1614676005&width=220)
Up to $24.10 off
In StockTorque Solution V3 Billet Pitch Stop Engine Mount | TS-SU-011
Fits: 02-26 WRX, 04-21 STI
Regular price From $87.00Sale price From $87.00 Regular priceUnit price per$111.10
![Company23 [08-21 STI] Standard Boost Control Solenoid| 530](http://jdmuscleusa.com/cdn/shop/products/company23-standard-boost-control-solenoid-subaru-sti-2008-2020-boost-control-solenoids-company23-cop-530.jpg?v=1614538775&width=220)
![Remark [15-21 WRX/STI] SPT Style Axle Back w/ Double Wall Burnt Tips | RO-TTSP-D](http://jdmuscleusa.com/cdn/shop/products/remark-axleback-exhaust-titanium-stainless-double-wall-tip-spt-version-subaru-wrx-sti-2015-2019-axle-back-exhausts-remark-ro-ttsp-d.jpg?v=1745512159&width=220)
![Remark [15-21 WRX/STI] SPT Style Axle Back w/ Double Wall Burnt Tips | RO-TTSP-D](http://jdmuscleusa.com/cdn/shop/files/remark-spt-style-axle-back-w-double-wall-burnt-tips-2015-2021-wrx-2015-2021-sti-ro-ttsp-d-833272_530x643_556c1068-76d3-48ff-b389-5326ebc48059.jpg?v=1745512159&width=220)
![Torque Solution [02-25 WRX, 04-21 STI] V3 Billet Pitch Stop Engine Mount | TS-SU-011](http://jdmuscleusa.com/cdn/shop/products/torque-solution-v3-billet-pitch-stop-engine-mount-subaru-wrx-2002-2014-sti-2004-2019-engine-mounts-torque-solution-black-tqsts-su-011.jpg?v=1614518869&width=220)
![Torque Solution [02-25 WRX, 04-21 STI] V3 Billet Pitch Stop Engine Mount | TS-SU-011](http://jdmuscleusa.com/cdn/shop/products/torque-solution-v3-billet-pitch-stop-engine-mount-subaru-wrx-2002-2014-sti-2004-2019-engine-mounts-torque-solution-2.jpg?v=1614676005&width=220)