2015-2021 Subaru STI Engine Parts & Upgrades
Shop 2015-2021 subaru sti engine parts and performance upgrades at JDMuscle. We carry the top brands with guaranteed fitment for your 2015-2021 Subaru STI.
2015-2021 Subaru STI Engine
-
In StockTurbo XS 15-21 STI Blow Off Valve to Intercooler Rubber Coated Metal Gasket | GWS02-BOV
Regular price $15.00Sale price $15.00 Regular priceUnit price per$15.00 -
![MBRP [15 - 21 WRX 2.0L/STI 2.5L] 2.5in Dual Split Rear Exit w/ 3.5" CF Tips - T304 | S48013CF - JDMuscleAxle Back ExhaustsmbrpS48013CF](//jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-cf-tips-t304-s48013cf-9483336.jpg?v=1770327579&width=220)
![MBRP [15 - 21 WRX 2.0L/STI 2.5L] 2.5in Dual Split Rear Exit w/ 3.5" CF Tips - T304 | S48013CF - JDMuscleAxle Back ExhaustsmbrpS48013CF](//jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-cf-tips-t304-s48013cf-5413636.jpg?v=1770327580&width=220)
Up to $125.88 off
In StockMBRP 2.5in Dual Split Rear Exit w/ 3.5" CF Tips - T304
Fits: 15-21 WRX 2.0L/STI 2.5L
Only 4 leftRegular price $534.99Sale price $534.99 Regular priceUnit price per$660.87 -
![Perrin [15 - 21 WRX/STI] Radiator Shroud Without OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 2NY - JDMuscleRadiator ShroudsperPSP-ENG-512-2NY](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-neon-yellow-psp-eng-512-2ny-2248735.jpg?v=1770327578&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud Without OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 2NY - JDMuscleRadiator ShroudsperPSP-ENG-512-2NY](//jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-neon-yellow-psp-eng-512-2ny-9737858.jpg?v=1770327579&width=220)
Up to $21.75 off
In StockPerrin Radiator Shroud Without OEM Intake Scoop - Neon Yellow | PSP-ENG-512-2NY
Fits: 15-21 WRX/STI
Only 11 leftRegular price $123.25Sale price $123.25 Regular priceUnit price per$145.00 -
Up to $20 off
In StockTomei High Performance Valve Spring Set Turbo Models
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Only 5 leftRegular price $180.00Sale price $180.00 Regular priceUnit price per$200.00 -
IAG 06-14 WRX, 04-21 STI Air / Oil Separator | AOS Competition to Street Series Conversion Kit | IAG-ENG-7113
Regular price $104.99Sale price $104.99 Regular priceUnit price per$104.99 -
In StockIAG 08-14 WRX / 08-20 STI / 05-09 LGT AOS Replacement Harness Relocation Bracket | IAG-RPL-7151HR
Only 1 leftRegular price $14.99Sale price $14.99 Regular priceUnit price per$14.99 -
![Gates [04 - 14 WRX, 04 - 21 STI] Racing Timing Belt Kit | TCK328RB - JDMuscleTiming Belt ComponentsTCK328RB](//jdmuscleusa.com/cdn/shop/files/gates-04-14-wrx-04-21-sti-racing-timing-belt-kit-tck328rb-4786491.jpg?v=1770327639&width=220)
Up to $1,363.03 off
In StockGates Racing Timing Belt Kit | TCK328RB
Fits: 04-14 WRX, 04-21 STI
Only 4 leftRegular price $470.00Sale price $470.00 Regular priceUnit price per$1,833.03 -
IAG Performance MAF Sensor Block Off Plate Silver
Fits: 08-14 WRX, 08-21 STI, 05-09 LGT
Regular price $41.99Sale price $41.99 Regular priceUnit price per$41.99 -
![Cusco [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Aluminum Pulley Set | 6A1 - 733 - A - JDMusclePulleyscus6A1-733-A](//jdmuscleusa.com/cdn/shop/files/cusco-02-14-wrx-04-21-sti-05-09-lgt-aluminum-pulley-set-6a1-733-a-6902588.jpg?v=1770327688&width=220)
![Cusco [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Aluminum Pulley Set | 6A1 - 733 - A - JDMusclePulleyscus6A1-733-A](//jdmuscleusa.com/cdn/shop/files/cusco-02-14-wrx-04-21-sti-05-09-lgt-aluminum-pulley-set-6a1-733-a-2260376.jpg?v=1770327688&width=220)
Up to $54 offCusco Aluminum Pulley Set | 6A1-733-A
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT
Regular price $486.00Sale price $486.00 Regular priceUnit price per$540.00 -
Up to $9.15 off
In StockPerrin 06-14 WRX / 07-21 STI / 12-16 Impreza / 06-13 FXT / 05-09 Legacy Alternator Pulley Blue | PSP-ENG-119BL
Only 5 leftRegular price $51.85Sale price $51.85 Regular priceUnit price per$61.00 -
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Polished Tips and No Muffler for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35SSW - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35SSW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-polished-tips-and-no-muffler-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35ssw-3762911.jpg?v=1770327808&width=220)
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Polished Tips and No Muffler for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35SSW - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35SSW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-polished-tips-and-no-muffler-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35ssw-3096433.jpg?v=1770327809&width=220)
Nameless Performance Axle Back Polished Tips and No Muffler for Invidia Q300 / R400 Catback Exhaust Systems
Fits: 11-21 WRX Sedan, 11-21 STI Sedan
Regular price $730.00Sale price $730.00 Regular priceUnit price per$0.00 -
Verus Engineering 15-21 STI Air Oil Separator - Black | A0323A-BLK
Regular price $428.95Sale price $428.95 Regular priceUnit price per$428.95 -
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3" Double Wall Polished Tips and 4" Mufflers | SUAB15WRX - 4MU - 30SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-4MU-30SDW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-3-double-wall-polished-tips-and-4-mufflers-suab15wrx-4mu-30sdw-6518727.jpg?v=1770327864&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back 3.5" Single Wall Polished Tips and No Muffler | SUAB15WRX - 0MU - 35SSW - JDMuscleAxle Back ExhaustsSUAB15WRX-0MU-35SSW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-35-single-wall-polished-tips-and-no-muffler-suab15wrx-0mu-35ssw-1129950.jpg?v=1770327693&width=220)
Nameless Performance Axle Back Exhaust w/ 3" Double Wall Polished Tips and 4" Mufflers
Fits: 15-21 WRX, 15-18 STI
Regular price $880.00Sale price $880.00 Regular priceUnit price per$0.00 -
![COBB [15 - 21 STI] NexGen Stage 2 to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Management SensorscobbNEXGENFF001](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-to-stage-2-flex-fuel-power-package-upgrade-3710940.jpg?v=1770327866&width=220)
![COBB [15 - 21 STI] NexGen Stage 2 to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Management SensorscobbNEXGENFF001](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-to-stage-2-flex-fuel-power-package-upgrade-3113632.jpg?v=1770327866&width=220)
Up to $8 offCobb Tuning NexGen Stage 2 to Stage 2+ Flex Fuel Package Upgrade
Fits: 15-21 WRX STI, 08-14 Impreza STI
Regular price $972.00Sale price $972.00 Regular priceUnit price per$980.00 -
![COBB [15 - 21 STI] Previous Ethanol Sensor to NexGen Fuel Ethanol Sensor Kit - Module + Harness Only - JDMuscleEngine Management Sensorscobb315670](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-previous-ethanol-sensor-to-nexgen-fuel-ethanol-sensor-kit-module-harness-only-9461054.jpg?v=1770327867&width=220)
![COBB [15 - 21 STI] Previous Ethanol Sensor to NexGen Fuel Ethanol Sensor Kit - Module + Harness Only - JDMuscleEngine Management Sensorscobb315670](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-previous-ethanol-sensor-to-nexgen-fuel-ethanol-sensor-kit-module-harness-only-8251517.jpg?v=1770327867&width=220)
In StockCobb Tuning Previous Ethanol Sensor to NexGen Flex Fuel Upgrade - Module + Harness Only
Fits: 08-14 WRX, 08-21 STI
Only 13 leftRegular price $540.00Sale price $540.00 Regular priceUnit price per$540.00 -
![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
![MBRP [15 - 21 WRX 2.0L/STI 2.5L] 2.5in Dual Split Rear Exit w/ 3.5" CF Tips - T304 | S48013CF - JDMuscleAxle Back ExhaustsmbrpS48013CF](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-cf-tips-t304-s48013cf-9483336.jpg?v=1770327579&width=220)
![MBRP [15 - 21 WRX 2.0L/STI 2.5L] 2.5in Dual Split Rear Exit w/ 3.5" CF Tips - T304 | S48013CF - JDMuscleAxle Back ExhaustsmbrpS48013CF](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrx-20lsti-25l-25in-dual-split-rear-exit-w-35-cf-tips-t304-s48013cf-5413636.jpg?v=1770327580&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud Without OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 2NY - JDMuscleRadiator ShroudsperPSP-ENG-512-2NY](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-neon-yellow-psp-eng-512-2ny-2248735.jpg?v=1770327578&width=220)
![Perrin [15 - 21 WRX/STI] Radiator Shroud Without OEM Intake Scoop - Neon Yellow | PSP - ENG - 512 - 2NY - JDMuscleRadiator ShroudsperPSP-ENG-512-2NY](http://jdmuscleusa.com/cdn/shop/products/perrin-15-21-wrxsti-radiator-shroud-without-oem-intake-scoop-neon-yellow-psp-eng-512-2ny-9737858.jpg?v=1770327579&width=220)
![Gates [04 - 14 WRX, 04 - 21 STI] Racing Timing Belt Kit | TCK328RB - JDMuscleTiming Belt ComponentsTCK328RB](http://jdmuscleusa.com/cdn/shop/files/gates-04-14-wrx-04-21-sti-racing-timing-belt-kit-tck328rb-4786491.jpg?v=1770327639&width=220)
![Cusco [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Aluminum Pulley Set | 6A1 - 733 - A - JDMusclePulleyscus6A1-733-A](http://jdmuscleusa.com/cdn/shop/files/cusco-02-14-wrx-04-21-sti-05-09-lgt-aluminum-pulley-set-6a1-733-a-6902588.jpg?v=1770327688&width=220)
![Cusco [02 - 14 WRX, 04 - 21 STI, 05 - 09 LGT] Aluminum Pulley Set | 6A1 - 733 - A - JDMusclePulleyscus6A1-733-A](http://jdmuscleusa.com/cdn/shop/files/cusco-02-14-wrx-04-21-sti-05-09-lgt-aluminum-pulley-set-6a1-733-a-2260376.jpg?v=1770327688&width=220)
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Polished Tips and No Muffler for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35SSW - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35SSW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-polished-tips-and-no-muffler-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35ssw-3762911.jpg?v=1770327808&width=220)
![Nameless Performance [11 - 21 WRX Sedan, 11 - 21 STI Sedan] Axle Back Polished Tips and No Muffler for Invidia Q300 / R400 Catback Exhaust Systems | SUAB15STI - INV - 35SSW - JDMuscleAxle Back ExhaustsSUAB15STI-INV-35SSW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-11-21-wrx-sedan-11-21-sti-sedan-axle-back-polished-tips-and-no-muffler-for-invidia-q300-r400-catback-exhaust-systems-suab15sti-inv-35ssw-3096433.jpg?v=1770327809&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3" Double Wall Polished Tips and 4" Mufflers | SUAB15WRX - 4MU - 30SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-4MU-30SDW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-3-double-wall-polished-tips-and-4-mufflers-suab15wrx-4mu-30sdw-6518727.jpg?v=1770327864&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back 3.5" Single Wall Polished Tips and No Muffler | SUAB15WRX - 0MU - 35SSW - JDMuscleAxle Back ExhaustsSUAB15WRX-0MU-35SSW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-35-single-wall-polished-tips-and-no-muffler-suab15wrx-0mu-35ssw-1129950.jpg?v=1770327693&width=220)
![COBB [15 - 21 STI] NexGen Stage 2 to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Management SensorscobbNEXGENFF001](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-to-stage-2-flex-fuel-power-package-upgrade-3710940.jpg?v=1770327866&width=220)
![COBB [15 - 21 STI] NexGen Stage 2 to Stage 2 + Flex Fuel Power Package Upgrade - JDMuscleEngine Management SensorscobbNEXGENFF001](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-nexgen-stage-2-to-stage-2-flex-fuel-power-package-upgrade-3113632.jpg?v=1770327866&width=220)
![COBB [15 - 21 STI] Previous Ethanol Sensor to NexGen Fuel Ethanol Sensor Kit - Module + Harness Only - JDMuscleEngine Management Sensorscobb315670](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-previous-ethanol-sensor-to-nexgen-fuel-ethanol-sensor-kit-module-harness-only-9461054.jpg?v=1770327867&width=220)
![COBB [15 - 21 STI] Previous Ethanol Sensor to NexGen Fuel Ethanol Sensor Kit - Module + Harness Only - JDMuscleEngine Management Sensorscobb315670](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-sti-previous-ethanol-sensor-to-nexgen-fuel-ethanol-sensor-kit-module-harness-only-8251517.jpg?v=1770327867&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-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)