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
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![Remark [15-21 WRX/STI] Mid Pipe Kit Non Resonated | RO-CPVA-N](//jdmuscleusa.com/cdn/shop/products/remark-mid-pipe-kit-non-resonated-subaru-wrxsti-2015-2019-exhaust-mid-pipes-remark-ro-cpva-n.jpg?v=1745512176&width=220)
In StockRemark Mid Pipe Kit Non Resonated | RO-CPVA-N
Fits: 15-21 WRX/STI
Only 12 leftRegular price $755.00Sale price $755.00 Regular priceUnit price per$755.00 -
![Grimmspeed [15-21 WRX/STI] Radiator Shroud | 0960X](//jdmuscleusa.com/cdn/shop/products/grimmspeed-radiator-shroud-subaru-wrx-sti-2015-2020-096042-096039-radiator-shrouds-grimmspeed-red-grm096042.jpg?v=1614517847&width=220)
![Grimmspeed [15-21 WRX/STI] Radiator Shroud | 0960X](//jdmuscleusa.com/cdn/shop/products/grimmspeed-radiator-shroud-subaru-wrx-sti-2015-2020-096042-096039-radiator-shrouds-grimmspeed-2.jpg?v=1614675482&width=220)
In StockGrimmspeed Radiator Shroud | 0960X
Fits: 15-21 WRX/STI
Only 19 leftRegular price $124.00Sale price $124.00 Regular priceUnit price per$124.00 -
![Invidia [08-14 WRX, 08-21 STI] High Flow Cat w/ Extra 02 Bung Downpipe | HS08SW1DOC](//jdmuscleusa.com/cdn/shop/products/HS08SW1DOC_19b4e6d0-dee2-44d1-b6d5-bb1d139c297c.gif?v=1573673614&width=220)
![Invidia [08-14 WRX, 08-21 STI] High Flow Cat w/ Extra 02 Bung Downpipe | HS08SW1DOC](//jdmuscleusa.com/cdn/shop/products/HS08SW1DOC_2.gif?v=1573673614&width=220)
Up to $401.20 off
In StockInvidia High Flow Cat w/ Extra 02 Bung Downpipe
Fits: 08-14 WRX, 08-21 STI
Regular price $884.00Sale price $884.00 Regular priceUnit price per$1,285.20 -
![Invidia [08-14 WRX / 08-21 STI] Downpipe w/ High Flow Cat | HS08SW1DOCB](//jdmuscleusa.com/cdn/shop/products/hs08sw1docb.gif?v=1630007732&width=220)
Up to $401.20 off
In StockInvidia Downpipe w/ High Flow Cat | HS08SW1DOCB
Fits: 08-14 WRX / 08-21 STI
Only 17 leftRegular price $884.00Sale price $884.00 Regular priceUnit price per$1,285.20 -
Up to $8.88 off
In StockTorque Solution Cylinder 4 Coolant Mod Line Kit
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-08 FXT
Regular price $80.00Sale price $80.00 Regular priceUnit price per$88.88 -
In StockRevel GT Dry Carbon Fuse Box Cover - 1 Piece
Fits: 15-21 WRX/STI
Only 17 leftRegular price $137.75Sale price $137.75 Regular priceUnit price per$137.75 -
Up to $27.20 off
In StockInvidia Stock Downpipe to 3in Exhaust Adapter - Universal
Regular price $61.00Sale price $61.00 Regular priceUnit price per$88.20 -
Up to $9.80 off
In StockCusco Jack Assist Ramp Set - Universal
Regular price $88.20Sale price $88.20 Regular priceUnit price per$98.00 -
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](//jdmuscleusa.com/cdn/shop/products/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-2623375.jpg?v=1770329179&width=220)
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](//jdmuscleusa.com/cdn/shop/files/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-7806168.jpg?v=1770329179&width=220)
In StockCobb Tuning SF Intake Replacement Filter
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT, 07-13 Mazdaspeed3
Regular price $68.00Sale price $68.00 Regular priceUnit price per$68.00 -
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023.jpg?v=1614517904&width=220)
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](//jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023-2.jpg?v=1614675514&width=220)
In StockGrimmSpeed Blow Off Valve Flange Gasket
Fits: 02-07 WRX, 04-21 STI
Only 1 leftRegular price $29.00Sale price $29.00 Regular priceUnit price per$29.00 -
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-8998082.jpg?v=1770336383&width=220)
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](//jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-5259871.jpg?v=1770336383&width=220)
In StockCobb Tuning Redline Carbon Fiber Alternator Cover - Gloss Finish
Fits: 08-14 WRX, 08-21 STI
Only 19 leftRegular price $183.00Sale price $183.00 Regular priceUnit price per$183.00 -
Up to $89 off
In StockTomei 08-14 WRX / 04-21 STI Equal Length Exhaust Manifold | TB6010-SB02B
Only 5 leftRegular price $801.00Sale price $801.00 Regular priceUnit price per$890.00 -
![HKS [08-21 STI] Super SQV4 Blow Off Valve - JDMuscleBlow Off Valveshks71008-AF013](//jdmuscleusa.com/cdn/shop/products/hks-08-21-sti-super-sqv4-blow-off-valve-8637108.jpg?v=1786515613&width=220)
In StockHKS Super SQV4 Blow Off Valve
Fits: 08-21 STI
Regular price $435.00Sale price $435.00 Regular priceUnit price per$435.00 -
![GrimmSpeed 3in Downpipe to Stock Cat-Back Adapter [Subaru Turbo Models inc. 15-21 WRX/STI] | 077044](//jdmuscleusa.com/cdn/shop/products/grimmspeed-3in-downpipe-adapter-for-subaru-077044-exhaust-gaskets-and-hardware-grimmspeed-grm077044.jpg?v=1614517852&width=220)
In StockGrimmSpeed 3in Downpipe to Stock Cat-Back Adapter
Fits: Subaru Turbo Models inc. 15-21 WRX/STI
Regular price $81.00Sale price $81.00 Regular priceUnit price per$81.00 -
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](//jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-black-grm090109.jpg?v=1614517802&width=220)
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](//jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-3.jpg?v=1614658473&width=220)
In StockGrimmspeed Top Mount Intercooler Silicone Coupler Kit Black
Fits: 02-14 WRX / 04-21 STI
Only 2 leftRegular price $135.00Sale price $135.00 Regular priceUnit price per$135.00 -
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](//jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048.jpg?v=1614517712&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](//jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048-2.jpg?v=1614675409&width=220)
In StockGrimmspeed Fender Shroud - Red | 096048
Fits: 15-21 WRX/STI
Only 5 leftRegular price $124.00Sale price $124.00 Regular priceUnit price per$124.00
![Remark [15-21 WRX/STI] Mid Pipe Kit Non Resonated | RO-CPVA-N](http://jdmuscleusa.com/cdn/shop/products/remark-mid-pipe-kit-non-resonated-subaru-wrxsti-2015-2019-exhaust-mid-pipes-remark-ro-cpva-n.jpg?v=1745512176&width=220)
![Grimmspeed [15-21 WRX/STI] Radiator Shroud | 0960X](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-radiator-shroud-subaru-wrx-sti-2015-2020-096042-096039-radiator-shrouds-grimmspeed-red-grm096042.jpg?v=1614517847&width=220)
![Grimmspeed [15-21 WRX/STI] Radiator Shroud | 0960X](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-radiator-shroud-subaru-wrx-sti-2015-2020-096042-096039-radiator-shrouds-grimmspeed-2.jpg?v=1614675482&width=220)
![Invidia [08-14 WRX, 08-21 STI] High Flow Cat w/ Extra 02 Bung Downpipe | HS08SW1DOC](http://jdmuscleusa.com/cdn/shop/products/HS08SW1DOC_19b4e6d0-dee2-44d1-b6d5-bb1d139c297c.gif?v=1573673614&width=220)
![Invidia [08-14 WRX, 08-21 STI] High Flow Cat w/ Extra 02 Bung Downpipe | HS08SW1DOC](http://jdmuscleusa.com/cdn/shop/products/HS08SW1DOC_2.gif?v=1573673614&width=220)
![Invidia [08-14 WRX / 08-21 STI] Downpipe w/ High Flow Cat | HS08SW1DOCB](http://jdmuscleusa.com/cdn/shop/products/hs08sw1docb.gif?v=1630007732&width=220)
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](http://jdmuscleusa.com/cdn/shop/products/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-2623375.jpg?v=1770329179&width=220)
![COBB SF Intake Replacement Intake Filter [Subaru Models] | 712101 - For 712100,715100,724100 - JDMuscleAir Intake Filter Replacementscobb712101](http://jdmuscleusa.com/cdn/shop/files/cobb-sf-intake-replacement-intake-filter-subaru-models-712101-for-712100715100724100-7806168.jpg?v=1770329179&width=220)
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023.jpg?v=1614517904&width=220)
![GrimmSpeed [02-07 WRX, 04-21 STI] Blow Off Valve Flange Gasket | 020023](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-subaru-intercooler-bov-gasket-wrx-2002-2005-sti-2004-2020-020023-gaskets-grimmspeed-grm020023-2.jpg?v=1614675514&width=220)
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-8998082.jpg?v=1770336383&width=220)
![Cobb [08 - 14 WRX/ 08 - 21 STI] Redline Carbon Fiber Alternator Cover Gloss Finish | 422600 - JDMuscleAlternator Coverscobb422600](http://jdmuscleusa.com/cdn/shop/products/cobb-08-14-wrx-08-21-sti-redline-carbon-fiber-alternator-cover-gloss-finish-422600-5259871.jpg?v=1770336383&width=220)
![HKS [08-21 STI] Super SQV4 Blow Off Valve - JDMuscleBlow Off Valveshks71008-AF013](http://jdmuscleusa.com/cdn/shop/products/hks-08-21-sti-super-sqv4-blow-off-valve-8637108.jpg?v=1786515613&width=220)
![GrimmSpeed 3in Downpipe to Stock Cat-Back Adapter [Subaru Turbo Models inc. 15-21 WRX/STI] | 077044](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-3in-downpipe-adapter-for-subaru-077044-exhaust-gaskets-and-hardware-grimmspeed-grm077044.jpg?v=1614517852&width=220)
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-black-grm090109.jpg?v=1614517802&width=220)
![Grimmspeed [02-14 WRX / 04-21 STI] Top Mount Intercooler Silicone Coupler Kit Black](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-top-mount-intercooler-silicone-hose-kit-subaru-wrx-2002-2007-sti-2004-2020-090108-090109-intercooler-hose-kits-grimmspeed-3.jpg?v=1614658473&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048.jpg?v=1614517712&width=220)
![Grimmspeed [15-21 WRX/STI] Fender Shroud - Red | 096048](http://jdmuscleusa.com/cdn/shop/products/grimmspeed-fender-shroud-red-subaru-wrx-sti-2015-2020-096048-fender-shrouds-grimmspeed-grm096048-2.jpg?v=1614675409&width=220)