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.
Subaru STI 2015-2021 Engine Parts
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![Invidia [08-14 WRX/ 08-21 STI] High Flow Catted Downpipe | HS08SW1DPC](//jdmuscleusa.com/cdn/shop/products/invidia-high-flow-catted-downpipe-subaru-wrx-2008-2014-sti-2008-2019-legacy-gt-2005-2009-hs08sw1dpc-front-pipes-and-downpipes-y-pipes-invidia-invhs08sw1dpc.jpg?v=1614517009&width=220)
Up to $296 offInvidia High Flow Catted Downpipe
Fits: 08-14 WRX, 08-21 STI
Regular price $697.00Sale price $697.00 Regular priceUnit price per$993.00 -
![GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](//jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046.jpg?v=1614517761&width=220)
![GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](//jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046-2.jpg?v=1614675435&width=220)
In StockGrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo | 077046
Fits: Subaru Models, incl. 15-21 WRX/STI
Regular price $90.00Sale price $90.00 Regular priceUnit price per$90.00 -
![COBB [15 - 21 WRX/STI, 14 - 18 FXT] V3 AccessPORT - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-004](//jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-14-18-fxt-v3-accessport-1329863.png?v=1770336568&width=220)
![COBB [15 - 21 WRX/STI, 14 - 18 FXT] V3 AccessPORT - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-004](//jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-14-18-fxt-v3-accessport-9445235.jpg?v=1770336568&width=220)
In StockCOBB V3 AccessPORT
Fits: 15-21 WRX/STI, 14-18 FXT
Regular price $770.00Sale price $770.00 Regular priceUnit price per$770.00 -
![PERRIN Performance [15-21 WRX/STI] Fender Shrouds | PSP-ENG-550](//jdmuscleusa.com/cdn/shop/products/perrin-performance-fender-shrouds-for-2015wrxsti-psp-eng-550-fender-shrouds-perrin-performance.jpg?v=1737769354&width=220)
![PERRIN Performance [15-21 WRX/STI] Fender Shrouds | PSP-ENG-550](//jdmuscleusa.com/cdn/shop/products/perrin-performance-fender-shrouds-for-2015wrxsti-psp-eng-550-fender-shrouds-perrin-performance-black-papsp-eng-550bk-2.jpg?v=1737769354&width=220)
Up to $24 off
In StockPERRIN Fender Shrouds
Fits: 15-21 WRX/STI
Regular price From $105.40Sale price From $105.40 Regular priceUnit price per$124.00 -
In StockGrimmSpeed Turbo to Downpipe Gasket - Subaru Turbo
Regular price $34.00Sale price $34.00 Regular priceUnit price per$34.00 -
![Suya Performance Billet Aluminum Engine Bay Caps 4PC Set [All Subaru Models] - JDMuscleDress Up KitsSUYA-ENG-SUB-SISilver](//jdmuscleusa.com/cdn/shop/files/suya-performance-billet-aluminum-engine-bay-caps-4pc-set-all-subaru-models-8911560.png?v=1770332249&width=220)
![Suya Performance Billet Aluminum Engine Bay Caps 4PC Set [All Subaru Models] - JDMuscleDress Up KitsSUYA-ENG-SUB-SISilver](//jdmuscleusa.com/cdn/shop/products/suya-performance-billet-aluminum-engine-bay-caps-4pc-set-all-subaru-models-3731697.jpg?v=1770332249&width=220)
Up to $40 off
In StockSuya Performance Billet Aluminum Engine Bay Caps 4PC Set
Fits: All Subaru Models
Regular price From $129.00Sale price From $129.00 Regular priceUnit price per$169.00 -
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](//jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance.jpg?v=1737769547&width=220)
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](//jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance-hyper-teal-papsp-eng-150te-2.jpg?v=1737769547&width=220)
Up to $17.55 off
In StockPerrin Belt Cover Black - Black/Red/Neon Yellow
Fits: 02-14 WRX, 04-21 STI
Regular price From $89.25Sale price From $89.25 Regular priceUnit price per$105.00 -
![Tomei [08-21 WRX Sedan, 11-21 STI Sedan] Expreme Ti Titanium Catback Exhaust | TB6090-SB02C](//jdmuscleusa.com/cdn/shop/products/tomei-expreme-ti-titanium-cat-back-exhaust-subaru-wrx-2008-2020-sti-2011-2020-sedan-cat-back-exhaust-system-tomei-tb6090-sb02c.jpg?v=1614535665&width=220)
![Tomei [08-21 WRX Sedan, 11-21 STI Sedan] Expreme Ti Titanium Catback Exhaust | TB6090-SB02C](//jdmuscleusa.com/cdn/shop/files/tomei-expreme-ti-titanium-catback-exhaust-2008-2021-wrx-sedan-2011-2021-sti-sedan-tb6090-sb02c-610565_626x417_0a72f42d-23a0-4c5b-86a9-0cb0a650c3e3.jpg?v=1746823721&width=220)
Up to $129 off
In StockTomei Expreme Ti Titanium Catback Exhaust | TB6090-SB02C
Fits: 08-21 WRX Sedan, 11-21 STI Sedan
Only 5 leftRegular price $1,161.00Sale price $1,161.00 Regular priceUnit price per$1,290.00 -
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](//jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-wrinkle-red-finish-121033.jpg?v=1614560912&width=220)
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](//jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-2.jpg?v=1614560913&width=220)
In StockGrimmSpeed Lightweight Battery Tie Down
Fits: All Subaru Models
Regular price $60.00Sale price $60.00 Regular priceUnit price per$60.00 -
![Perrin [15-21 WRX/STI] Radiator Shroud | PSP-ENG-512](//jdmuscleusa.com/cdn/shop/products/perrin-radiator-shroud-subaru-wrx-sti-2015-psp-eng-512rd-radiator-shrouds-perrin-performance.jpg?v=1737769550&width=220)
![Perrin [15-21 WRX/STI] Radiator Shroud | PSP-ENG-512](//jdmuscleusa.com/cdn/shop/products/perrin-radiator-shroud-subaru-wrx-sti-2015-psp-eng-512rd-radiator-shrouds-perrin-performance-black-papsp-eng-512bk-2.jpg?v=1737769550&width=220)
Up to $32.25 off
In StockPerrin Radiator Shroud
Fits: 15-21 WRX/STI
Regular price From $164.90Sale price From $164.90 Regular priceUnit price per$194.00 -
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](//jdmuscleusa.com/cdn/shop/products/perrin-24-in-turbo-inlet-subaru-subaru-wrx-2002-2014-sti-2004-2020-forester-xt-2004-2008-legacy-gt-2005-2009-psp-int-401bk-turbo-inlet-hoses-and-pipes-perrin-performance-black-papsp-int-401bk.jpg?v=1737769440&width=220)
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](//jdmuscleusa.com/cdn/shop/files/psp-int-401rd_01x800_332061ca-fb72-4351-a345-329612bc1d26.jpg?v=1746731177&width=220)
Up to $49.95 off
In StockPerrin 2.4" Turbo Inlet Hose - Black/Red/Blue
Fits: 02-07 WRX, 04-21 STI, 04-08 FXT
Regular price $283.05Sale price $283.05 Regular priceUnit price per$333.00 -
![Blox Racing [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall 3.5 Inch Polished Tips | BXEX-51104](//jdmuscleusa.com/cdn/shop/products/blox-racing-axle-back-exhaust-subaru-2015-2020-wrx-2015-2020-sti-non-spt-axle-back-exhausts-blox-racing-bxex-51104.jpg?v=1614341853&width=220)
![Blox Racing [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall 3.5 Inch Polished Tips | BXEX-51104](//jdmuscleusa.com/cdn/shop/products/blox-racing-axle-back-exhaust-subaru-2015-2020-wrx-2015-2020-sti-non-spt-axle-back-exhausts-blox-racing-bxex-51104-2.jpg?v=1614341857&width=220)
Up to $140 off
In StockBlox Racing Stainless Steel Axle Back w/ Single Wall 3.5 Inch Polished Tips
Fits: 15-21 WRX/STI
Regular price $287.00Sale price $287.00 Regular priceUnit price per$427.00 -
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT] Uppipe to Turbo Gasket | 024001](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-up-pipe-to-turbo-gasket-gasket-024001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-024001.jpg?v=1614517788&width=220)
In StockGrimmSpeed Uppipe to Turbo Gasket
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT
Regular price $31.00Sale price $31.00 Regular priceUnit price per$31.00 -
![Koyo [08-21 WRX/STI] Radiator | VH091662](//jdmuscleusa.com/cdn/shop/products/vh091662.gif?v=1614327130&width=220)
![Koyo [08-21 WRX/STI] Radiator | VH091662](//jdmuscleusa.com/cdn/shop/products/koyo-radiator-subaru-wrx-sti-2008-2020-subaru-legacy-gt-2005-2009-manual-transmission-vh091662-radiators-koyo-cooling-koyvh091662-2.jpg?v=1614675210&width=220)
Up to $157.60 off
In StockKoyo Radiator | VH091662
Fits: 08-21 WRX/STI
Regular price $408.00Sale price $408.00 Regular priceUnit price per$565.60 -
![JDMuscle [15-21 WRX/STI] Pre-preg Carbon Fiber Exhaust Trim Covers](//jdmuscleusa.com/cdn/shop/files/image_21008_1874364499_1620165679_6091c42fe552b.jpg?v=1772885858&width=220)
In StockJDMuscle Pre-preg Carbon Fiber Exhaust Trim Covers
Fits: 15-21 WRX/STI
Only 7 leftRegular price $184.00Sale price $184.00 Regular priceUnit price per$184.00 -
![Turbo XS [WRX/STI] OEM Downpipe to 3in Cat - Back Adapter w/Standard Exhaust Gasket | ADA - OEMDP - 3CB - JDMuscleExhaust Gaskets and HardwaretxsADA-OEMDP-3CB](//jdmuscleusa.com/cdn/shop/products/turbo-xs-wrxsti-oem-downpipe-to-3in-cat-back-adapter-wstandard-exhaust-gasket-ada-oemdp-3cb-3432239.jpg?v=1770328593&width=220)
Up to $9 offTurbo XS OEM Downpipe to 3in Cat-Back Adapter w/Standard Exhaust Gasket
Fits: WRX/STI
Regular price $30.00Sale price $30.00 Regular priceUnit price per$39.00
![Invidia [08-14 WRX/ 08-21 STI] High Flow Catted Downpipe | HS08SW1DPC](http://jdmuscleusa.com/cdn/shop/products/invidia-high-flow-catted-downpipe-subaru-wrx-2008-2014-sti-2008-2019-legacy-gt-2005-2009-hs08sw1dpc-front-pipes-and-downpipes-y-pipes-invidia-invhs08sw1dpc.jpg?v=1614517009&width=220)
![GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046.jpg?v=1614517761&width=220)
![GrimmSpeed OEM Downpipe to 3in Cat Back Adapter Turbo [Subaru Models, incl. 15-21 WRX/STI] | 077046](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-catback-adapter-stock-dp-to-aftermarket-3-in-subaru-wrx-sti-legacy-gt-forester-xt-077046-exhaust-gaskets-and-hardware-grimmspeed-grm077046-2.jpg?v=1614675435&width=220)
![COBB [15 - 21 WRX/STI, 14 - 18 FXT] V3 AccessPORT - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-004](http://jdmuscleusa.com/cdn/shop/files/cobb-15-21-wrxsti-14-18-fxt-v3-accessport-1329863.png?v=1770336568&width=220)
![COBB [15 - 21 WRX/STI, 14 - 18 FXT] V3 AccessPORT - JDMusclePlug and Play Engine ManagementcobbAP3-SUB-004](http://jdmuscleusa.com/cdn/shop/products/cobb-15-21-wrxsti-14-18-fxt-v3-accessport-9445235.jpg?v=1770336568&width=220)
![PERRIN Performance [15-21 WRX/STI] Fender Shrouds | PSP-ENG-550](http://jdmuscleusa.com/cdn/shop/products/perrin-performance-fender-shrouds-for-2015wrxsti-psp-eng-550-fender-shrouds-perrin-performance.jpg?v=1737769354&width=220)
![PERRIN Performance [15-21 WRX/STI] Fender Shrouds | PSP-ENG-550](http://jdmuscleusa.com/cdn/shop/products/perrin-performance-fender-shrouds-for-2015wrxsti-psp-eng-550-fender-shrouds-perrin-performance-black-papsp-eng-550bk-2.jpg?v=1737769354&width=220)
![Suya Performance Billet Aluminum Engine Bay Caps 4PC Set [All Subaru Models] - JDMuscleDress Up KitsSUYA-ENG-SUB-SISilver](http://jdmuscleusa.com/cdn/shop/files/suya-performance-billet-aluminum-engine-bay-caps-4pc-set-all-subaru-models-8911560.png?v=1770332249&width=220)
![Suya Performance Billet Aluminum Engine Bay Caps 4PC Set [All Subaru Models] - JDMuscleDress Up KitsSUYA-ENG-SUB-SISilver](http://jdmuscleusa.com/cdn/shop/products/suya-performance-billet-aluminum-engine-bay-caps-4pc-set-all-subaru-models-3731697.jpg?v=1770332249&width=220)
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](http://jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance.jpg?v=1737769547&width=220)
![Perrin [02-14 WRX / 04-21 STI] Belt Cover Black - Black/Red/Neon Yellow| PSP-ENG-150](http://jdmuscleusa.com/cdn/shop/products/perrin-alternator-cover-subaru-wrx-2002-2014-sti-2004-2019-blackredneon-yellow-psp-eng-150-alternator-covers-perrin-performance-hyper-teal-papsp-eng-150te-2.jpg?v=1737769547&width=220)
![Tomei [08-21 WRX Sedan, 11-21 STI Sedan] Expreme Ti Titanium Catback Exhaust | TB6090-SB02C](http://jdmuscleusa.com/cdn/shop/products/tomei-expreme-ti-titanium-cat-back-exhaust-subaru-wrx-2008-2020-sti-2011-2020-sedan-cat-back-exhaust-system-tomei-tb6090-sb02c.jpg?v=1614535665&width=220)
![Tomei [08-21 WRX Sedan, 11-21 STI Sedan] Expreme Ti Titanium Catback Exhaust | TB6090-SB02C](http://jdmuscleusa.com/cdn/shop/files/tomei-expreme-ti-titanium-catback-exhaust-2008-2021-wrx-sedan-2011-2021-sti-sedan-tb6090-sb02c-610565_626x417_0a72f42d-23a0-4c5b-86a9-0cb0a650c3e3.jpg?v=1746823721&width=220)
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-wrinkle-red-finish-121033.jpg?v=1614560912&width=220)
![GrimmSpeed Lightweight Battery Tie Down [All Subaru Models]](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-lightweight-battery-tie-down-multiple-subaru-fitments-121026-battery-tie-downs-and-trays-grimmspeed-2.jpg?v=1614560913&width=220)
![Perrin [15-21 WRX/STI] Radiator Shroud | PSP-ENG-512](http://jdmuscleusa.com/cdn/shop/products/perrin-radiator-shroud-subaru-wrx-sti-2015-psp-eng-512rd-radiator-shrouds-perrin-performance.jpg?v=1737769550&width=220)
![Perrin [15-21 WRX/STI] Radiator Shroud | PSP-ENG-512](http://jdmuscleusa.com/cdn/shop/products/perrin-radiator-shroud-subaru-wrx-sti-2015-psp-eng-512rd-radiator-shrouds-perrin-performance-black-papsp-eng-512bk-2.jpg?v=1737769550&width=220)
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](http://jdmuscleusa.com/cdn/shop/products/perrin-24-in-turbo-inlet-subaru-subaru-wrx-2002-2014-sti-2004-2020-forester-xt-2004-2008-legacy-gt-2005-2009-psp-int-401bk-turbo-inlet-hoses-and-pipes-perrin-performance-black-papsp-int-401bk.jpg?v=1737769440&width=220)
![Perrin [02-07 WRX, 04-21 STI, 04-08 FXT] 2.4" Turbo Inlet Hose - Black/Red/Blue | PSP-INT-401](http://jdmuscleusa.com/cdn/shop/files/psp-int-401rd_01x800_332061ca-fb72-4351-a345-329612bc1d26.jpg?v=1746731177&width=220)
![Blox Racing [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall 3.5 Inch Polished Tips | BXEX-51104](http://jdmuscleusa.com/cdn/shop/products/blox-racing-axle-back-exhaust-subaru-2015-2020-wrx-2015-2020-sti-non-spt-axle-back-exhausts-blox-racing-bxex-51104.jpg?v=1614341853&width=220)
![Blox Racing [15-21 WRX/STI] Stainless Steel Axle Back w/ Single Wall 3.5 Inch Polished Tips | BXEX-51104](http://jdmuscleusa.com/cdn/shop/products/blox-racing-axle-back-exhaust-subaru-2015-2020-wrx-2015-2020-sti-non-spt-axle-back-exhausts-blox-racing-bxex-51104-2.jpg?v=1614341857&width=220)
![GrimmSpeed [02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT] Uppipe to Turbo Gasket | 024001](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-up-pipe-to-turbo-gasket-gasket-024001-exhaust-gaskets-and-hardware-grimmspeed-grmgasket-024001.jpg?v=1614517788&width=220)
![Koyo [08-21 WRX/STI] Radiator | VH091662](http://jdmuscleusa.com/cdn/shop/products/vh091662.gif?v=1614327130&width=220)
![Koyo [08-21 WRX/STI] Radiator | VH091662](http://jdmuscleusa.com/cdn/shop/products/koyo-radiator-subaru-wrx-sti-2008-2020-subaru-legacy-gt-2005-2009-manual-transmission-vh091662-radiators-koyo-cooling-koyvh091662-2.jpg?v=1614675210&width=220)
![JDMuscle [15-21 WRX/STI] Pre-preg Carbon Fiber Exhaust Trim Covers](http://jdmuscleusa.com/cdn/shop/files/image_21008_1874364499_1620165679_6091c42fe552b.jpg?v=1772885858&width=220)
![Turbo XS [WRX/STI] OEM Downpipe to 3in Cat - Back Adapter w/Standard Exhaust Gasket | ADA - OEMDP - 3CB - JDMuscleExhaust Gaskets and HardwaretxsADA-OEMDP-3CB](http://jdmuscleusa.com/cdn/shop/products/turbo-xs-wrxsti-oem-downpipe-to-3in-cat-back-adapter-wstandard-exhaust-gasket-ada-oemdp-3cb-3432239.jpg?v=1770328593&width=220)