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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![Extreme Online Store [15 - 21 WRX / STi] Axle Back Quad Burnt Tips Exhaust - JDMuscleAxle Back ExhaustsEXT-MD002-BTQuad Burnt Tips](//jdmuscleusa.com/cdn/shop/files/extreme-online-store-15-21-wrx-sti-axle-back-quad-burnt-tips-exhaust-7063058.jpg?v=1770326790&width=220)
![Extreme Online Store [15 - 21 WRX / STi] Axle Back Quad Burnt Tips Exhaust - JDMuscleAxle Back ExhaustsEXT-MD002-BTQuad Burnt Tips](//jdmuscleusa.com/cdn/shop/files/extreme-online-store-15-21-wrx-sti-axle-back-quad-burnt-tips-exhaust-5366294.jpg?v=1770326791&width=220)
EOS Axle Back Quad Burnt Tips Exhaust
Fits: 15-21 WRX / STI
Regular price $330.00Sale price $330.00 Regular priceUnit price per$289.98 -
![Extreme Online Store [08 - 21 STI / 08 - 14 WRX] Performance Catted Downpipe - JDMuscleFront Pipes and Downpipes / J - Pipes](//jdmuscleusa.com/cdn/shop/files/extreme-online-store-08-21-sti-08-14-wrx-performance-catted-downpipe-8738233.jpg?v=1770326780&width=220)
![Extreme Online Store [08 - 21 STI / 08 - 14 WRX] Performance Catted Downpipe - JDMuscleFront Pipes and Downpipes / J - Pipes](//jdmuscleusa.com/cdn/shop/files/extreme-online-store-08-21-sti-08-14-wrx-performance-catted-downpipe-2866454.jpg?v=1770326780&width=220)
EOS Performance Catted Downpipe
Fits: 08-21 STI / 08-14 WRX
Regular price $380.00Sale price $380.00 Regular priceUnit price per$329.98 -
![COBB [08 - 21 WRX/STI] Redline Fuse Cover - Gloss Finish - JDMuscleFuse Box Coverscobb844660](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-wrxsti-redline-fuse-cover-gloss-finish-7155898.jpg?v=1770330626&width=220)
![COBB [08 - 21 WRX/STI] Redline Fuse Cover - Gloss Finish - JDMuscleFuse Box Coverscobb844660](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-wrxsti-redline-fuse-cover-gloss-finish-7089390.jpg?v=1770330626&width=220)
In StockCOBB Redline Fuse Cover - Gloss Finish
Fits: 08-21 WRX/STI
Only 13 leftRegular price $207.00Sale price $207.00 Regular priceUnit price per$207.00 -
![Cobb [06-14 WRX, 04-21 STI, 05-09 LGT, 04-08 FXT] Spark Plug Set One Step Colder | D44700](//jdmuscleusa.com/cdn/shop/products/b1aa4f1627c975827869c09c78278c4e.jpg?v=1660655055&width=220)
![Cobb [06 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] Spark Plug Set One Step Colder - JDMuscleSpark PlugscobbD44700](//jdmuscleusa.com/cdn/shop/files/cobb-06-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-spark-plug-set-one-step-colder-1998864.jpg?v=1770330674&width=220)
In StockCobb Spark Plug Set One Step Colder
Fits: 06-14 WRX, 04-21 STI, 05-09 LGT, 04-08 FXT
Regular price $68.00Sale price $68.00 Regular priceUnit price per$68.00 -
![Tomei [02-07 WRX, 04-21 STI, 04-08 FXT] Silicone Turbo Inlet Hose - Black | TB301A-SB01B](//jdmuscleusa.com/cdn/shop/products/TB301A-SB01B.jpg?v=1669932204&width=220)
![Tomei [02-07 WRX, 04-21 STI, 04-08 FXT] Silicone Turbo Inlet Hose - Black | TB301A-SB01B](//jdmuscleusa.com/cdn/shop/products/TB301A-SB01B_1.jpg?v=1667810532&width=220)
Up to $19 off
In StockTomei Silicone Turbo Inlet Hose - Black | TB301A-SB01B
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Only 5 leftRegular price $171.00Sale price $171.00 Regular priceUnit price per$190.00 -
Up to $20.50 off
In StockPerrin Oil Cap Round Style Red Most Subaru Models
Regular price $61.50Sale price $61.50 Regular priceUnit price per$82.00 -
![COBB [08 - 21 STI] Silicone Turbo Inlet V2 - Black - JDMuscleTurbo Inlet Hoses and Pipescobb712450](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-silicone-turbo-inlet-v2-black-5349387.jpg?v=1770336440&width=220)
![COBB [08 - 21 STI] Silicone Turbo Inlet V2 - Black - JDMuscleTurbo Inlet Hoses and Pipescobb712450](//jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-silicone-turbo-inlet-v2-black-7767070.jpg?v=1770336440&width=220)
In StockCOBB Silicone Turbo Inlet V2-Black
Fits: 08-21 STI
Regular price $290.00Sale price $290.00 Regular priceUnit price per$290.00 -
![Grimmspeed [08-21 WRX / 08-18 STI / 09-18 Forester / 13-17 Crosstrek / 05-17 Legacy] DRY-CON Panel Filter | 060091 - JDMuscleHigh Flow Replacement Panel Filtersgrm060091](//jdmuscleusa.com/cdn/shop/products/grimmspeed-08-21-wrx-08-18-sti-09-18-forester-13-17-crosstrek-05-17-legacy-dry-con-panel-filter-060091-5367637.jpg?v=1781013196&width=220)
![Grimmspeed [08-21 WRX / 08-18 STI / 09-18 Forester / 13-17 Crosstrek / 05-17 Legacy] DRY-CON Panel Filter | 060091 - JDMuscleHigh Flow Replacement Panel Filtersgrm060091](//jdmuscleusa.com/cdn/shop/products/grimmspeed-08-21-wrx-08-18-sti-09-18-forester-13-17-crosstrek-05-17-legacy-dry-con-panel-filter-060091-3575296.jpg?v=1781013196&width=220)
Grimmspeed DRY-CON Panel Filter | 060091
Fits: 08-21 WRX / 08-18 STI / 09-18 Forester / 13-17 Crosstrek / 05-17 Legacy
Regular price $82.00Sale price $82.00 Regular priceUnit price per$82.00 -
Up to $20.53 off
In StockARP Head Studs 11mm Subaru Turbo Models
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price $283.00Sale price $283.00 Regular priceUnit price per$303.53 -
GrimmSpeed Downpipe to Catback 3in Gasket - Universal | 022001
Regular price $42.00Sale price $42.00 Regular priceUnit price per$42.00 -
Up to $22 off
In StockPerrin Oil Cap Round Style Neon Yellow Most Subaru Models
Regular price $66.00Sale price $66.00 Regular priceUnit price per$88.00 -
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger (Set of 4) | 070047 - JDMuscleExhaust Hangersgrm070047](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-set-of-4-070047-5797139.jpg?v=1770328223&width=220)
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger (Set of 4) | 070047 - JDMuscleExhaust Hangersgrm070047](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-set-of-4-070047-5761858.jpg?v=1770328224&width=220)
Grimmspeed 12MM Two Position Exhaust Hanger (Set of 4) | 070047
Fits: 08-21 WRX/STI, 05-09 LGT, 13-21 BRZ
Regular price $66.00Sale price $66.00 Regular priceUnit price per$66.00 -
Subaru OEM 1.3 Bar Radiator Cap Subaru All Models
Regular price $76.95Sale price $76.95 Regular priceUnit price per$76.95 -
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 Legacy GT, 09 - 13 Forester XT, 05 - 09 Outback XT] 3 - Port Boost Control Solenoid (BCS)| 715750 - JDMuscleBoost Control Solenoidscobb715750](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-legacy-gt-09-13-forester-xt-05-09-outback-xt-3-port-boost-control-solenoid-bcs-715750-7295743.jpg?v=1770336560&width=220)
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 Legacy GT, 09 - 13 Forester XT, 05 - 09 Outback XT] 3 - Port Boost Control Solenoid (BCS)| 715750 - JDMuscleBoost Control Solenoidscobb715750](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-legacy-gt-09-13-forester-xt-05-09-outback-xt-3-port-boost-control-solenoid-bcs-715750-4255865.jpg?v=1770336560&width=220)
In StockCOBB 3-Port Boost Control Solenoid (BCS)
Fits: 08-14 WRX, 08-21 STI, 05-09 LGT/OBXT, 09-13 FXT
Regular price $188.00Sale price $188.00 Regular priceUnit price per$188.00 -
![Revel [15-21 WRX / STI] GT Dry Carbon Air Intake Cover - 1 Piece | 1TR4GT0AS08](//jdmuscleusa.com/cdn/shop/products/1TR4GT0AS08.jpg?v=1669934847&width=220)
Up to $12.75 off
In StockRevel GT Dry Carbon Air Intake Cover - 1 Piece | 1TR4GT0AS08
Fits: 15-21 WRX/STI
Only 7 leftRegular price $242.25Sale price $242.25 Regular priceUnit price per$255.00 -
Up to $13.20 off
In StockTial 44mm MVR External Wastegate - Universal
Regular price From $439.95Sale price From $439.95 Regular priceUnit price per$453.15
![Extreme Online Store [15 - 21 WRX / STi] Axle Back Quad Burnt Tips Exhaust - JDMuscleAxle Back ExhaustsEXT-MD002-BTQuad Burnt Tips](http://jdmuscleusa.com/cdn/shop/files/extreme-online-store-15-21-wrx-sti-axle-back-quad-burnt-tips-exhaust-7063058.jpg?v=1770326790&width=220)
![Extreme Online Store [15 - 21 WRX / STi] Axle Back Quad Burnt Tips Exhaust - JDMuscleAxle Back ExhaustsEXT-MD002-BTQuad Burnt Tips](http://jdmuscleusa.com/cdn/shop/files/extreme-online-store-15-21-wrx-sti-axle-back-quad-burnt-tips-exhaust-5366294.jpg?v=1770326791&width=220)
![Extreme Online Store [08 - 21 STI / 08 - 14 WRX] Performance Catted Downpipe - JDMuscleFront Pipes and Downpipes / J - Pipes](http://jdmuscleusa.com/cdn/shop/files/extreme-online-store-08-21-sti-08-14-wrx-performance-catted-downpipe-8738233.jpg?v=1770326780&width=220)
![Extreme Online Store [08 - 21 STI / 08 - 14 WRX] Performance Catted Downpipe - JDMuscleFront Pipes and Downpipes / J - Pipes](http://jdmuscleusa.com/cdn/shop/files/extreme-online-store-08-21-sti-08-14-wrx-performance-catted-downpipe-2866454.jpg?v=1770326780&width=220)
![COBB [08 - 21 WRX/STI] Redline Fuse Cover - Gloss Finish - JDMuscleFuse Box Coverscobb844660](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-wrxsti-redline-fuse-cover-gloss-finish-7155898.jpg?v=1770330626&width=220)
![COBB [08 - 21 WRX/STI] Redline Fuse Cover - Gloss Finish - JDMuscleFuse Box Coverscobb844660](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-wrxsti-redline-fuse-cover-gloss-finish-7089390.jpg?v=1770330626&width=220)
![Cobb [06-14 WRX, 04-21 STI, 05-09 LGT, 04-08 FXT] Spark Plug Set One Step Colder | D44700](http://jdmuscleusa.com/cdn/shop/products/b1aa4f1627c975827869c09c78278c4e.jpg?v=1660655055&width=220)
![Cobb [06 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] Spark Plug Set One Step Colder - JDMuscleSpark PlugscobbD44700](http://jdmuscleusa.com/cdn/shop/files/cobb-06-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-spark-plug-set-one-step-colder-1998864.jpg?v=1770330674&width=220)
![Tomei [02-07 WRX, 04-21 STI, 04-08 FXT] Silicone Turbo Inlet Hose - Black | TB301A-SB01B](http://jdmuscleusa.com/cdn/shop/products/TB301A-SB01B.jpg?v=1669932204&width=220)
![Tomei [02-07 WRX, 04-21 STI, 04-08 FXT] Silicone Turbo Inlet Hose - Black | TB301A-SB01B](http://jdmuscleusa.com/cdn/shop/products/TB301A-SB01B_1.jpg?v=1667810532&width=220)
![COBB [08 - 21 STI] Silicone Turbo Inlet V2 - Black - JDMuscleTurbo Inlet Hoses and Pipescobb712450](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-silicone-turbo-inlet-v2-black-5349387.jpg?v=1770336440&width=220)
![COBB [08 - 21 STI] Silicone Turbo Inlet V2 - Black - JDMuscleTurbo Inlet Hoses and Pipescobb712450](http://jdmuscleusa.com/cdn/shop/products/cobb-08-21-sti-silicone-turbo-inlet-v2-black-7767070.jpg?v=1770336440&width=220)
![Grimmspeed [08-21 WRX / 08-18 STI / 09-18 Forester / 13-17 Crosstrek / 05-17 Legacy] DRY-CON Panel Filter | 060091 - JDMuscleHigh Flow Replacement Panel Filtersgrm060091](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-08-21-wrx-08-18-sti-09-18-forester-13-17-crosstrek-05-17-legacy-dry-con-panel-filter-060091-5367637.jpg?v=1781013196&width=220)
![Grimmspeed [08-21 WRX / 08-18 STI / 09-18 Forester / 13-17 Crosstrek / 05-17 Legacy] DRY-CON Panel Filter | 060091 - JDMuscleHigh Flow Replacement Panel Filtersgrm060091](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-08-21-wrx-08-18-sti-09-18-forester-13-17-crosstrek-05-17-legacy-dry-con-panel-filter-060091-3575296.jpg?v=1781013196&width=220)
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger (Set of 4) | 070047 - JDMuscleExhaust Hangersgrm070047](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-set-of-4-070047-5797139.jpg?v=1770328223&width=220)
![Grimmspeed [08 - 21 WRX/STI, 05 - 09 LGT, 13 - 21 BRZ] 12MM Two Position Exhaust Hanger (Set of 4) | 070047 - JDMuscleExhaust Hangersgrm070047](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-wrxsti-05-09-lgt-13-21-brz-12mm-two-position-exhaust-hanger-set-of-4-070047-5761858.jpg?v=1770328224&width=220)
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 Legacy GT, 09 - 13 Forester XT, 05 - 09 Outback XT] 3 - Port Boost Control Solenoid (BCS)| 715750 - JDMuscleBoost Control Solenoidscobb715750](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-legacy-gt-09-13-forester-xt-05-09-outback-xt-3-port-boost-control-solenoid-bcs-715750-7295743.jpg?v=1770336560&width=220)
![COBB [08 - 14 WRX, 08 - 21 STI, 05 - 09 Legacy GT, 09 - 13 Forester XT, 05 - 09 Outback XT] 3 - Port Boost Control Solenoid (BCS)| 715750 - JDMuscleBoost Control Solenoidscobb715750](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-05-09-legacy-gt-09-13-forester-xt-05-09-outback-xt-3-port-boost-control-solenoid-bcs-715750-4255865.jpg?v=1770336560&width=220)
![Revel [15-21 WRX / STI] GT Dry Carbon Air Intake Cover - 1 Piece | 1TR4GT0AS08](http://jdmuscleusa.com/cdn/shop/products/1TR4GT0AS08.jpg?v=1669934847&width=220)
