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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HKS 15-21 STI Dry Carbon Suction Kit | 70026-AF001
Regular price $715.00Sale price $715.00 Regular priceUnit price per$715.00 -
Subaru OEM Front Crossover Gasket EJ20 / EJ25 | 44022AA160
Regular price $20.02Sale price $20.02 Regular priceUnit price per$20.02 -
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back w/ 4" Double Wall Polished Tips and 5" Mufflers | SUAB15WRX - 5MU - 40SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-5MU-40SDW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-w-4-double-wall-polished-tips-and-5-mufflers-suab15wrx-5mu-40sdw-2322911.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 w/ 4" Double Wall Polished Tips and 5" Mufflers
Fits: 15-21 WRX, 15-18 STI
Regular price $1,140.00Sale price $1,140.00 Regular priceUnit price per$0.00 -
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3.5" Single Wall Neochrome Tips and 4" Mufflers | SUAB15WRX - 4MU - 35NEO - JDMuscleAxle Back ExhaustsSUAB15WRX-4MU-35NEO](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-35-single-wall-neochrome-tips-and-4-mufflers-suab15wrx-4mu-35neo-7575894.jpg?v=1770327864&width=220)
Nameless Performance Axle Back Exhaust w/ 3.5" Single Wall Neochrome Tips and 4" Mufflers
Fits: 15-21 WRX, 15-18 STI
Regular price $1,000.00Sale price $1,000.00 Regular priceUnit price per$668.00 -
IAG Black Racing Timing Belt
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $229.99Sale price $229.99 Regular priceUnit price per$229.99 -
Turbo XS 08-21 STI 20G Turbocharger | TU-EJ-TXS400
Regular price $1,319.20Sale price $1,319.20 Regular priceUnit price per$1,319.20 -
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 2 + Flex Fuel Power Package w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-BK](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-2-flex-fuel-power-package-w-black-intake-6436396.jpg?v=1770327871&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 2 + Flex Fuel Power Package w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-BK](//jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-2-flex-fuel-power-package-w-black-intake-3390982.jpg?v=1770327872&width=220)
In StockCOBB NexGen Stage 2 + Flex Fuel Power Package w/ Black Intake
Fits: 18 STI Type RA, 19-21 STI
Only 13 leftRegular price $4,440.00Sale price $4,440.00 Regular priceUnit price per$4,440.00 -
![IAG Performance [02 - 14 WRX, 04 - 21 STI , 05 - 12 LGT ,04 - 13 FXT] 3mm Thick Phenolic Spacers | IAG - AFD - 3103 - JDMusclePhenolic Thermal Intake Manifold SpacersIAG-AFD-3103](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-3mm-thick-phenolic-spacers-iag-afd-3103-7120303.jpg?v=1770327865&width=220)
IAG 3mm Thick Phenolic Spacers
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $69.99Sale price $69.99 Regular priceUnit price per$69.99 -
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back 3" Double Wall Polished Tips and No Muffler | SUAB15WRX - 0MU - 30SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-0MU-30SDW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-3-double-wall-polished-tips-and-no-muffler-suab15wrx-0mu-30sdw-4293261.webp?v=1770327866&width=220)
Nameless Performance Axle Back 3" Double Wall Polished Tips and No Muffler | SUAB15WRX-0MU-30SDW
Fits: 15-21 WRX, 15-18 STI
Regular price $630.00Sale price $630.00 Regular priceUnit price per$415.00 -
IAG Performance 3 Inch Aluminum MAF Mounting Flange
Fits: 08-14 WRX, 08-21 STI
Regular price $43.99Sale price $43.99 Regular priceUnit price per$43.99 -
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3.5" Double Wall Polished Tips and 4" Mufflers | SUAB15WRX - 4MU - 35SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-4MU-35SDW](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-35-double-wall-polished-tips-and-4-mufflers-suab15wrx-4mu-35sdw-6618366.jpg?v=1770327868&width=220)
Nameless Performance Axle Back Exhaust w/ 3.5" Double Wall Polished Tips and 4" Mufflers
Fits: 15-21 WRX, 15-18 STI
Regular price $1,000.00Sale price $1,000.00 Regular priceUnit price per$0.00 -
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Track Package Catback W/ Raw Tip and No Muffler | SUCB15WRXTP - NOTIP - JDMuscleCat Back Exhaust SystemSUCB15WRXTP-NOTIP](//jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-track-package-catback-w-raw-tip-and-no-muffler-sucb15wrxtp-notip-7611433.jpg?v=1770327868&width=220)
Nameless Performance Track Package Catback W/ Raw Tip and No Muffler | SUCB15WRXTP-NOTIP
Fits: 15-21 WRX, 15-18 STI
Regular price $1,010.00Sale price $1,010.00 Regular priceUnit price per$713.00 -
IAG Performance V3 Street Series Air / Oil Separator | AOS Replacement Line / Hardware Kit
Fits: 08-14 WRX, 08-21 STI
Regular price $239.99Sale price $239.99 Regular priceUnit price per$239.99 -
IAG Performance V3 Top Feed Fuel Rails Red
Fits: 02-14 WRX, 07-21 STI, 08-12 LGT, 06-13 FXT
Regular price $219.99Sale price $219.99 Regular priceUnit price per$219.99 -
Injen 18-21 STI H4 2.5L Turbo SP Aluminum Series Cold Air Intake - Polished | SP1208P
Regular price $398.62Sale price $398.62 Regular priceUnit price per$398.62 -
In StockInjen 18-21 STI H4-2.5L Turbo SP Aluminum Series Cold Air Intake - Wrinkle Red | SP1208WR
Only 5 leftRegular price $398.62Sale price $398.62 Regular priceUnit price per$398.62
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back w/ 4" Double Wall Polished Tips and 5" Mufflers | SUAB15WRX - 5MU - 40SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-5MU-40SDW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-w-4-double-wall-polished-tips-and-5-mufflers-suab15wrx-5mu-40sdw-2322911.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)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3.5" Single Wall Neochrome Tips and 4" Mufflers | SUAB15WRX - 4MU - 35NEO - JDMuscleAxle Back ExhaustsSUAB15WRX-4MU-35NEO](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-35-single-wall-neochrome-tips-and-4-mufflers-suab15wrx-4mu-35neo-7575894.jpg?v=1770327864&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 2 + Flex Fuel Power Package w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-2-flex-fuel-power-package-w-black-intake-6436396.jpg?v=1770327871&width=220)
![COBB [18 STI Type RA, 19 - 21 STI] NexGen Stage 2 + Flex Fuel Power Package w/ Black Intake - JDMuscleEngine Package DealscobbSUB004NG2S2FF-BK](http://jdmuscleusa.com/cdn/shop/files/cobb-18-sti-type-ra-19-21-sti-nexgen-stage-2-flex-fuel-power-package-w-black-intake-3390982.jpg?v=1770327872&width=220)
![IAG Performance [02 - 14 WRX, 04 - 21 STI , 05 - 12 LGT ,04 - 13 FXT] 3mm Thick Phenolic Spacers | IAG - AFD - 3103 - JDMusclePhenolic Thermal Intake Manifold SpacersIAG-AFD-3103](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-3mm-thick-phenolic-spacers-iag-afd-3103-7120303.jpg?v=1770327865&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back 3" Double Wall Polished Tips and No Muffler | SUAB15WRX - 0MU - 30SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-0MU-30SDW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-3-double-wall-polished-tips-and-no-muffler-suab15wrx-0mu-30sdw-4293261.webp?v=1770327866&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Axle Back Exhaust w/ 3.5" Double Wall Polished Tips and 4" Mufflers | SUAB15WRX - 4MU - 35SDW - JDMuscleAxle Back ExhaustsSUAB15WRX-4MU-35SDW](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-axle-back-exhaust-w-35-double-wall-polished-tips-and-4-mufflers-suab15wrx-4mu-35sdw-6618366.jpg?v=1770327868&width=220)
![Nameless Performance [15 - 21 WRX, 15 - 18 STI] Track Package Catback W/ Raw Tip and No Muffler | SUCB15WRXTP - NOTIP - JDMuscleCat Back Exhaust SystemSUCB15WRXTP-NOTIP](http://jdmuscleusa.com/cdn/shop/files/nameless-performance-15-21-wrx-15-18-sti-track-package-catback-w-raw-tip-and-no-muffler-sucb15wrxtp-notip-7611433.jpg?v=1770327868&width=220)
