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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![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](//jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-1669663.jpg?v=1770327869&width=220)
![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](//jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-2634892.jpg?v=1770327869&width=220)
Nameless Performance Bypass Valve
Fits: 02-07 WRX, 02-21 STI, 02-07 Forester XT
Regular price $460.00Sale price $460.00 Regular priceUnit price per$314.00 -
![ETS [15 - 21 WRX/STI] Catback Exhaust Rear Section Replacement Muffled w/ Polished Tips | 200 - 30 - EXH - 016 - JDMuscleMufflersETS200-30-EXH-016](//jdmuscleusa.com/cdn/shop/files/ets-15-21-wrxsti-catback-exhaust-rear-section-replacement-muffled-w-polished-tips-200-30-exh-016-2713907.webp?v=1770327867&width=220)
ETS Catback Exhaust Rear Section Replacement Muffled w/ Polished Tips
Fits: 15-21 WRX/STI
Regular price $845.00Sale price $845.00 Regular priceUnit price per$845.00 -
![Perrin [15 - 21 WRX/STI] Without OEM Intake Scoop 2pc Radiator Shroud Hyper Pink | PSP - ENG - 512 - 2HP - JDMuscleRadiator ShroudsperPSP-ENG-512-2HP](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-without-oem-intake-scoop-2pc-radiator-shroud-hyper-pink-psp-eng-512-2hp-3493968.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Without OEM Intake Scoop 2pc Radiator Shroud Hyper Pink | PSP - ENG - 512 - 2HP - JDMuscleRadiator ShroudsperPSP-ENG-512-2HP](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-without-oem-intake-scoop-2pc-radiator-shroud-hyper-pink-psp-eng-512-2hp-4018436.jpg?v=1770327921&width=220)
Up to $36.25 off
In StockPerrin Without OEM Intake Scoop 2pc Radiator Shroud Hyper Pink | PSP-ENG-512-2HP
Fits: 15-21 WRX/STI
Only 1 leftRegular price $108.75Sale price $108.75 Regular priceUnit price per$145.00 -
In StockInjen H4-2.5L Turbo SP Aluminum Series Cold Air Intake - Wrinkle Black
Fits: 18-21 STI
Only 2 leftRegular price $398.62Sale price $398.62 Regular priceUnit price per$398.62 -
![HPS Performance [15 - 21 STI] Black Cold Air Intake w/ Heatshield | 837 - 573WB - JDMuscleIntakesHPS837-573WB](//jdmuscleusa.com/cdn/shop/files/hps-performance-15-21-sti-black-cold-air-intake-w-heatshield-837-573wb-6543550.jpg?v=1770329175&width=220)
![HPS Performance [15 - 21 STI] Black Cold Air Intake w/ Heatshield | 837 - 573WB - JDMuscleIntakesHPS837-573WB](//jdmuscleusa.com/cdn/shop/files/hps-performance-15-21-sti-black-cold-air-intake-w-heatshield-837-573wb-2455727.jpg?v=1770329175&width=220)
Up to $10 offHPS Performance Black Cold Air Intake w/ Heatshield | 837-573WB
Fits: 15-21 STI
Regular price $271.00Sale price $271.00 Regular priceUnit price per$281.00 -
Up to $14 offHPS Performance 15-21 STI Full Cooling System Hose Kit Blue | 57-1516-BLUE
Regular price $318.00Sale price $318.00 Regular priceUnit price per$332.00 -
![Radium Engineering [15-21 WRX/STI] Fuel Pump Access Cover | 20-0746 - JDMuscleFuel Pumps and Accessoriesrad20-0746](//jdmuscleusa.com/cdn/shop/products/radium-engineering-15-21-wrxsti-fuel-pump-access-cover-20-0746-4071817.jpg?v=1781013553&width=220)
![Radium Engineering [15-21 WRX/STI] Fuel Pump Access Cover | 20-0746 - JDMuscleFuel Pumps and Accessoriesrad20-0746](//jdmuscleusa.com/cdn/shop/products/radium-engineering-15-21-wrxsti-fuel-pump-access-cover-20-0746-4541192.jpg?v=1781013554&width=220)
Up to $4 off
In StockRadium Engineering Fuel Pump Access Cover | 20-0746
Fits: 15-21 WRX/STI
Only 3 leftRegular price $75.95Sale price $75.95 Regular priceUnit price per$79.95 -
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Pump Hanger for use w/ DW400 Pumps | 20-0781-00 - JDMuscleFuel Pumps and Accessoriesrad20-0781-00](//jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-pump-hanger-for-use-w-dw400-pumps-20-0781-00-1683143.jpg?v=1781013620&width=220)
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Pump Hanger for use w/ DW400 Pumps | 20-0781-00 - JDMuscleFuel Pumps and Accessoriesrad20-0781-00](//jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-pump-hanger-for-use-w-dw400-pumps-20-0781-00-4343294.jpg?v=1781013620&width=220)
Up to $27 off
In StockRadium Engineering V2 Fuel Pump Hanger for use w/ DW400 Pumps | 20-0781-00
Fits: 08-21 WRX/STI, 05-09 LGT
Only 3 leftRegular price $512.95Sale price $512.95 Regular priceUnit price per$539.95 -
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](//jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-8532909.jpg?v=1770327911&width=220)
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](//jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-9811679.jpg?v=1770327911&width=220)
Up to $54.99 off
In StockTorque Solution 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS-SU-565-NR
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 1 leftRegular price $245.00Sale price $245.00 Regular priceUnit price per$299.99 -
![IAG Performance [08 - 14 WRX, 08 - 21 STI] V2 Street Series AOS Replacement Hose Line & Hardware Install Kit | IAG - RPL - 7151IK - JDMuscleAir Oil SeparatorsIAG-RPL-7151IK](//jdmuscleusa.com/cdn/shop/files/iag-performance-08-14-wrx-08-21-sti-v2-street-series-aos-replacement-hose-line-hardware-install-kit-iag-rpl-7151ik-6869419.jpg?v=1770327912&width=220)
IAG Performance V2 Street Series AOS Replacement Hose Line & Hardware Install Kit
Fits: 08-14 WRX, 08-21 STI
Regular price $239.99Sale price $239.99 Regular priceUnit price per$239.99 -
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Neochrome Tips for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35NEO - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35NEO](//jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-neochrome-tips-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35neo-7268990.jpg?v=1770327916&width=220)
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Neochrome Tips for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35NEO - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35NEO](//jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-neochrome-tips-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35neo-6130479.jpg?v=1770327916&width=220)
Nameless Performance Axle Back Neochrome Tips for Invidia Q300 / R400 Catback Exhaust Systems
Fits: 11-21 WRX Sedan, 11-21 STI Sedan
Regular price $840.00Sale price $840.00 Regular priceUnit price per$571.00 -
![IAG Performance [10 - 21 WRX/STI, 05 - 13 Legacy, 04 - 14 Impreza, 04 - 13 Forester, 05 - 09 Outback] Cooper Ring Head Gasket Pair EJ25 100MM Bore .051 Inch Thickness w/ 1/2 Inch or 11MM Head Studs | IAG - ENG - 1731P - JDMuscleHead GasketsIAG-ENG-1731P](//jdmuscleusa.com/cdn/shop/files/iag-performance-10-21-wrxsti-05-13-legacy-04-14-impreza-04-13-forester-05-09-outback-cooper-ring-head-gasket-pair-ej25-100mm-bore-051-inch-thickness-w-12-inch-o-7318148.jpg?v=1770327969&width=220)
IAG Performance Cooper Ring Head Gasket Pair EJ25 100MM Bore .051 Inch Thickness w/ 1/2 Inch or 11MM Head Studs | IAG-ENG-1731P
Fits: 10-21 WRX/STI, 05-13 Legacy, 04-14 Impreza, 04-13 Forester, 05-09 Outback
Regular price $249.99Sale price $249.99 Regular priceUnit price per$249.99 -
![Remark [15 - 21 WRX/STI] BOSO Edition Axle Back w/ Polished Tips | RO - TSVA - SL - JDMuscleAxle Back ExhaustsRO-TSVA-SL](//jdmuscleusa.com/cdn/shop/files/remark-15-21-wrxsti-boso-edition-axle-back-w-polished-tips-ro-tsva-sl-7434342.jpg?v=1770327973&width=220)
![Remark [15 - 21 WRX/STI] BOSO Edition Axle Back w/ Polished Tips | RO - TSVA - SL - JDMuscleAxle Back ExhaustsRO-TSVA-SL](//jdmuscleusa.com/cdn/shop/files/remark-15-21-wrxsti-boso-edition-axle-back-w-polished-tips-ro-tsva-sl-8479859.jpg?v=1770327973&width=220)
In StockRemark BOSO Edition Axle Back w/ Polished Tips
Fits: 15-21 WRX/STI
Only 5 leftRegular price $695.00Sale price $695.00 Regular priceUnit price per$695.00 -
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-7871498.jpg?v=1770327974&width=220)
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-8214944.jpg?v=1770327974&width=220)
IAG Performance Street Series Oil Pan Silver
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT
Regular price $529.99Sale price $529.99 Regular priceUnit price per$529.99 -
IAG Performance Blow Off Valve Adapter
Fits: 02-07 WRX, 04-21 STI
Regular price $49.99Sale price $49.99 Regular priceUnit price per$49.99 -
iBR FLX01 - Upgrade Kit | 3 Pin and 5 Pin Harnesses
Regular price $399.99Sale price $399.99 Regular priceUnit price per$399.99
![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-1669663.jpg?v=1770327869&width=220)
![Nameless Performance [02 - 07 WRX, 02 - 21 STI, 02 - 07 Forester XT] Bypass Valve | SUBPV02STI - 02WRX - 04FXT - JDMuscleValvesSUBPV02STI-02WRX-04FXT](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-02-07-wrx-02-21-sti-02-07-forester-xt-bypass-valve-subpv02sti-02wrx-04fxt-2634892.jpg?v=1770327869&width=220)
![ETS [15 - 21 WRX/STI] Catback Exhaust Rear Section Replacement Muffled w/ Polished Tips | 200 - 30 - EXH - 016 - JDMuscleMufflersETS200-30-EXH-016](http://jdmuscleusa.com/cdn/shop/files/ets-15-21-wrxsti-catback-exhaust-rear-section-replacement-muffled-w-polished-tips-200-30-exh-016-2713907.webp?v=1770327867&width=220)
![Perrin [15 - 21 WRX/STI] Without OEM Intake Scoop 2pc Radiator Shroud Hyper Pink | PSP - ENG - 512 - 2HP - JDMuscleRadiator ShroudsperPSP-ENG-512-2HP](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-without-oem-intake-scoop-2pc-radiator-shroud-hyper-pink-psp-eng-512-2hp-3493968.jpg?v=1770327921&width=220)
![Perrin [15 - 21 WRX/STI] Without OEM Intake Scoop 2pc Radiator Shroud Hyper Pink | PSP - ENG - 512 - 2HP - JDMuscleRadiator ShroudsperPSP-ENG-512-2HP](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-without-oem-intake-scoop-2pc-radiator-shroud-hyper-pink-psp-eng-512-2hp-4018436.jpg?v=1770327921&width=220)
![HPS Performance [15 - 21 STI] Black Cold Air Intake w/ Heatshield | 837 - 573WB - JDMuscleIntakesHPS837-573WB](http://jdmuscleusa.com/cdn/shop/files/hps-performance-15-21-sti-black-cold-air-intake-w-heatshield-837-573wb-6543550.jpg?v=1770329175&width=220)
![HPS Performance [15 - 21 STI] Black Cold Air Intake w/ Heatshield | 837 - 573WB - JDMuscleIntakesHPS837-573WB](http://jdmuscleusa.com/cdn/shop/files/hps-performance-15-21-sti-black-cold-air-intake-w-heatshield-837-573wb-2455727.jpg?v=1770329175&width=220)
![Radium Engineering [15-21 WRX/STI] Fuel Pump Access Cover | 20-0746 - JDMuscleFuel Pumps and Accessoriesrad20-0746](http://jdmuscleusa.com/cdn/shop/products/radium-engineering-15-21-wrxsti-fuel-pump-access-cover-20-0746-4071817.jpg?v=1781013553&width=220)
![Radium Engineering [15-21 WRX/STI] Fuel Pump Access Cover | 20-0746 - JDMuscleFuel Pumps and Accessoriesrad20-0746](http://jdmuscleusa.com/cdn/shop/products/radium-engineering-15-21-wrxsti-fuel-pump-access-cover-20-0746-4541192.jpg?v=1781013554&width=220)
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Pump Hanger for use w/ DW400 Pumps | 20-0781-00 - JDMuscleFuel Pumps and Accessoriesrad20-0781-00](http://jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-pump-hanger-for-use-w-dw400-pumps-20-0781-00-1683143.jpg?v=1781013620&width=220)
![Radium Engineering [08-21 WRX/STI, 05-09 LGT] V2 Fuel Pump Hanger for use w/ DW400 Pumps | 20-0781-00 - JDMuscleFuel Pumps and Accessoriesrad20-0781-00](http://jdmuscleusa.com/cdn/shop/products/radium-engineering-08-21-wrxsti-05-09-lgt-v2-fuel-pump-hanger-for-use-w-dw400-pumps-20-0781-00-4343294.jpg?v=1781013620&width=220)
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](http://jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-8532909.jpg?v=1770327911&width=220)
![Torque Solution [02 - 07 WRX, 04 - 21 STI, 04 - 08 FXT] 3 Inch Non Recirculating Style Turbo Inlet Hose Black | TS - SU - 565 - NR - JDMuscleTurbo Inlet Hoses and PipesTS-SU-565-NR](http://jdmuscleusa.com/cdn/shop/files/torque-solution-02-07-wrx-04-21-sti-04-08-fxt-3-inch-non-recirculating-style-turbo-inlet-hose-black-ts-su-565-nr-9811679.jpg?v=1770327911&width=220)
![IAG Performance [08 - 14 WRX, 08 - 21 STI] V2 Street Series AOS Replacement Hose Line & Hardware Install Kit | IAG - RPL - 7151IK - JDMuscleAir Oil SeparatorsIAG-RPL-7151IK](http://jdmuscleusa.com/cdn/shop/files/iag-performance-08-14-wrx-08-21-sti-v2-street-series-aos-replacement-hose-line-hardware-install-kit-iag-rpl-7151ik-6869419.jpg?v=1770327912&width=220)
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Neochrome Tips for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35NEO - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35NEO](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-neochrome-tips-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35neo-7268990.jpg?v=1770327916&width=220)
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Neochrome Tips for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35NEO - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35NEO](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-neochrome-tips-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35neo-6130479.jpg?v=1770327916&width=220)
![IAG Performance [10 - 21 WRX/STI, 05 - 13 Legacy, 04 - 14 Impreza, 04 - 13 Forester, 05 - 09 Outback] Cooper Ring Head Gasket Pair EJ25 100MM Bore .051 Inch Thickness w/ 1/2 Inch or 11MM Head Studs | IAG - ENG - 1731P - JDMuscleHead GasketsIAG-ENG-1731P](http://jdmuscleusa.com/cdn/shop/files/iag-performance-10-21-wrxsti-05-13-legacy-04-14-impreza-04-13-forester-05-09-outback-cooper-ring-head-gasket-pair-ej25-100mm-bore-051-inch-thickness-w-12-inch-o-7318148.jpg?v=1770327969&width=220)
![Remark [15 - 21 WRX/STI] BOSO Edition Axle Back w/ Polished Tips | RO - TSVA - SL - JDMuscleAxle Back ExhaustsRO-TSVA-SL](http://jdmuscleusa.com/cdn/shop/files/remark-15-21-wrxsti-boso-edition-axle-back-w-polished-tips-ro-tsva-sl-7434342.jpg?v=1770327973&width=220)
![Remark [15 - 21 WRX/STI] BOSO Edition Axle Back w/ Polished Tips | RO - TSVA - SL - JDMuscleAxle Back ExhaustsRO-TSVA-SL](http://jdmuscleusa.com/cdn/shop/files/remark-15-21-wrxsti-boso-edition-axle-back-w-polished-tips-ro-tsva-sl-8479859.jpg?v=1770327973&width=220)
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-7871498.jpg?v=1770327974&width=220)
![IAG Performance [02 - 14 WRX / 04 - 21 STI / 05 - 09 LGT / 04 - 13 FXT] Street Series Oil Pan Silver | IAG - ENG - 2200SL - JDMuscleOil PansIAG-ENG-2200SL](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt-street-series-oil-pan-silver-iag-eng-2200sl-8214944.jpg?v=1770327974&width=220)
