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 StockDmann Tuning WRX/STI OTS 'Flash and Go'
Regular price $150.00Sale price $150.00 Regular priceUnit price per$150.00 -
![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 Tuning V3 AccessPORT
Fits: 15-21 WRX/STI, 14-18 Forester XT
Regular price $770.00Sale price $770.00 Regular priceUnit price per$770.00 -
![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 $390 off
In StockInvidia High Flow Catted Downpipe
Fits: 08-14 WRX, 08-21 STI
Regular price $861.00Sale price $861.00 Regular priceUnit price per$1,251.00 -
![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
Fits: Subaru Models, incl. 15-21 WRX/STI
Regular price $80.00Sale price $80.00 Regular priceUnit price per$80.00 -
In StockGrimmSpeed Turbo to Downpipe Gasket - Subaru Turbo
Regular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
![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 $81 off
In StockSuya Performance Billet Aluminum Engine Bay Caps 4PC Set
Fits: All Subaru Models
Only 9 leftRegular price From $88.00Sale price From $88.00 Regular priceUnit price per$169.00 -
![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 $32.90 off
In StockBlox Racing Stainless Steel Axle Back w/ Single Wall 3.5 Inch Polished Tips
Fits: 15-21 WRX/STI
Regular price $296.10Sale price $296.10 Regular priceUnit price per$329.00 -
![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 From $59.00Sale price From $59.00 Regular priceUnit price per$59.00 -
![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 $140.60 off
In StockKoyo Radiator
Fits: 08-21 WRX/STI
Regular price $425.00Sale price $425.00 Regular priceUnit price per$565.60 -
![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 $26.00Sale price $26.00 Regular priceUnit price per$26.00 -
![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 $4 offTurbo XS OEM Downpipe to 3in Cat-Back Adapter w/Standard Exhaust Gasket
Fits: WRX/STI
Regular price $35.00Sale price $35.00 Regular priceUnit price per$39.00 -
![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 $229.00Sale price $229.00 Regular priceUnit price per$229.00 -
![Grimmspeed [22-26 WRX, 19-21 STI] DRY-CON Panel Filter - JDMuscleHigh Flow Replacement Panel Filtersgrm060089](//jdmuscleusa.com/cdn/shop/products/grimmspeed-22-26-wrx-19-21-sti-dry-con-panel-filter-8960911.jpg?v=1781013147&width=220)
![Grimmspeed [22-26 WRX, 19-21 STI] DRY-CON Panel Filter - JDMuscleHigh Flow Replacement Panel Filtersgrm060089](//jdmuscleusa.com/cdn/shop/products/grimmspeed-22-26-wrx-19-21-sti-dry-con-panel-filter-4050588.jpg?v=1781013148&width=220)
In StockGrimmspeed DRY-CON Panel Filter
Fits: 22-26 WRX, 19-21 STI
Only 1 leftRegular price $92.00Sale price $92.00 Regular priceUnit price per$92.00 -
RES X JDMuscle Valvetronic Catback Exhaust MT&CVT *Special Order*
Fits: 15-21 WRX/STI
Regular price From $2,370.00Sale price From $2,370.00 Regular priceUnit price per$2,370.00 -
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](//jdmuscleusa.com/cdn/shop/products/tomei-unequal-length-exhaust-manifold-subaru-wrx-2002-2014-sti-2004-2020-exhaust-headers-and-manifolds-tomei-tb6010-sb02a.jpg?v=1614535670&width=220)
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](//jdmuscleusa.com/cdn/shop/files/tomei-unequal-length-exhaust-manifold-2002-2014-wrx-2004-2021-sti-2005-2009-lgt-2005-2008-fxt-tb6010-sb02a-724209_500x375_fdb4fc10-610a-4882-9d2d-4660ce65554e.jpg?v=1686347698&width=220)
Up to $89 off
In StockTomei Unequal Length Exhaust Manifold/ Header | TB6010-SB02A
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT
Only 5 leftRegular price $801.00Sale price $801.00 Regular priceUnit price per$890.00 -
![JDMuscle OEM Downpipe to 3in Cat Back Exhaust Adapter [Subaru Turbo Models] - JDMuscleExhaust Gaskets and HardwareJDM-EXS-S3](//jdmuscleusa.com/cdn/shop/files/jdmuscle-oem-downpipe-to-3in-cat-back-exhaust-adapter-subaru-turbo-models-1502085.png?v=1770322461&width=220)
In StockJDMuscle OEM Downpipe to 3in Cat Back Exhaust Adapter
Fits: Subaru Turbo Models
Only 20 leftRegular price $49.00Sale price $49.00 Regular priceUnit price per$49.00
![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)
![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)
![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)
![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 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)
![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)
![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)
![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)
![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)
![Grimmspeed [22-26 WRX, 19-21 STI] DRY-CON Panel Filter - JDMuscleHigh Flow Replacement Panel Filtersgrm060089](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-22-26-wrx-19-21-sti-dry-con-panel-filter-8960911.jpg?v=1781013147&width=220)
![Grimmspeed [22-26 WRX, 19-21 STI] DRY-CON Panel Filter - JDMuscleHigh Flow Replacement Panel Filtersgrm060089](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-22-26-wrx-19-21-sti-dry-con-panel-filter-4050588.jpg?v=1781013148&width=220)
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](http://jdmuscleusa.com/cdn/shop/products/tomei-unequal-length-exhaust-manifold-subaru-wrx-2002-2014-sti-2004-2020-exhaust-headers-and-manifolds-tomei-tb6010-sb02a.jpg?v=1614535670&width=220)
![Tomei [02-14 WRX, 04-21 STI, 05-09 LGT, 05-08 FXT] Unequal Length Exhaust Manifold/ Header | TB6010-SB02A](http://jdmuscleusa.com/cdn/shop/files/tomei-unequal-length-exhaust-manifold-2002-2014-wrx-2004-2021-sti-2005-2009-lgt-2005-2008-fxt-tb6010-sb02a-724209_500x375_fdb4fc10-610a-4882-9d2d-4660ce65554e.jpg?v=1686347698&width=220)
![JDMuscle OEM Downpipe to 3in Cat Back Exhaust Adapter [Subaru Turbo Models] - JDMuscleExhaust Gaskets and HardwareJDM-EXS-S3](http://jdmuscleusa.com/cdn/shop/files/jdmuscle-oem-downpipe-to-3in-cat-back-exhaust-adapter-subaru-turbo-models-1502085.png?v=1770322461&width=220)