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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![Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST](//jdmuscleusa.com/cdn/shop/products/invidia-r400-gemini-single-layer-quad-titanium-tip-cat-back-exhaust-subaru-wrx-sti-2015-2020-hs15stigm4st-cat-back-exhaust-system-invidia-invhs15stigm4st.jpg?v=1614517010&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST](//jdmuscleusa.com/cdn/shop/products/invidia-r400-gemini-single-layer-quad-titanium-tip-cat-back-exhaust-subaru-wrx-sti-2015-2020-hs15stigm4st-cat-back-exhaust-system-invidia-invhs15stigm4st-2.jpg?v=1614675269&width=220)
Up to $926.40 off
In StockInvidia Gemini R400 Titanium Quad Tip Exhaust
Fits: 15-21 WRX/STI
Regular price $1,714.00Sale price $1,714.00 Regular priceUnit price per$2,640.40 -
RES X JDMuscle Valvetronic Catback Exhaust MT&CVT *Special Order*No Cancellation*
Fits: 15-21 WRX/STI
Regular price From $2,370.00Sale price From $2,370.00 Regular priceUnit price per$2,370.00 -
Up to $12.30 off
In StockPerrin Stiffi Battery Tie Down Red Subaru Models
Regular price $69.70Sale price $69.70 Regular priceUnit price per$82.00 -
Up to $3 off
In StockVibrant 2-Bolt High Temperature Exhaust Gasket - Universal
Regular price From $5.99Sale price From $5.99 Regular priceUnit price per$7.99 -
![Invidia [15-21 WRX/STI] Gemini R400 Stainless Steel Quad Tip Exhaust | HS15STIGM4SS](//jdmuscleusa.com/cdn/shop/products/invidia-r400-gemini-single-layer-quad-ss-tip-cat-back-exhaust-subaru-wrx-sti-2015-2019-hs15stigm4ss-cat-back-exhaust-system-invidia-invhs15stigm4ss.jpg?v=1624333318&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Stainless Steel Quad Tip Exhaust | HS15STIGM4SS](//jdmuscleusa.com/cdn/shop/files/invidia-gemini-r400-stainless-steel-quad-tip-exhaust-2015-2021-wrx-2015-2021-sti-hs15stigm4ss-966802_626x419_fccd9762-8c71-4dbc-9db0-162821c362c4.jpg?v=1686606167&width=220)
Up to $869.80 off
In StockInvidia Gemini R400 Stainless Steel Quad Tip Exhaust | HS15STIGM4SS
Fits: 15-21 WRX/STI
Regular price $1,611.00Sale price $1,611.00 Regular priceUnit price per$2,480.80 -
![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 4 leftRegular price $801.00Sale price $801.00 Regular priceUnit price per$890.00 -
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](//jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance.jpg?v=1737769395&width=220)
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](//jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance-2.jpg?v=1737769395&width=220)
Up to $41.70 off
In StockPerrin Recirculating Blow off Valve Red
Fits: 02-07 WRX, 04-21 STI
Regular price $236.30Sale price $236.30 Regular priceUnit price per$278.00 -
![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 19 leftRegular price $774.00Sale price $774.00 Regular priceUnit price per$774.00 -
![Invidia [15-21 WRX/STI, 14-17 FXT] N1 Dual Cat Back Exhaust Titanium Tips | HS15STIGTT](//jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-burnt-titanium-tips-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2019-hs15stigtt-cat-back-exhaust-system-invidia-invhs15stigtt.jpg?v=1614517012&width=220)
![Invidia [15-21 WRX/STI, 14-17 FXT] N1 Dual Cat Back Exhaust Titanium Tips | HS15STIGTT](//jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-burnt-titanium-tips-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2019-hs15stigtt-cat-back-exhaust-system-invidia-invhs15stigtt-2.jpg?v=1614675271&width=220)
Up to $656 off
In StockInvidia N1 Dual Cat Back Exhaust Titanium Tips
Fits: 15-21 WRX/STI
Regular price $1,213.00Sale price $1,213.00 Regular priceUnit price per$1,869.00 -
![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 6 leftRegular price $123.00Sale price $123.00 Regular priceUnit price per$123.00 -
![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 2 leftRegular price $49.00Sale price $49.00 Regular priceUnit price per$49.00 -
![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 $501 off
In StockInvidia High Flow Cat w/ Extra 02 Bung Downpipe
Fits: 08-14 WRX, 08-21 STI
Regular price $927.00Sale price $927.00 Regular priceUnit price per$1,428.00 -
![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 $501 off
In StockInvidia Downpipe w/ High Flow Cat | HS08SW1DOCB
Fits: 08-14 WRX / 08-21 STI
Regular price $927.00Sale price $927.00 Regular priceUnit price per$1,428.00 -
Up to $13.20 off
In StockPerrin Battery Tie Down Neon Yellow
Fits: Most Subaru Models
Regular price $74.80Sale price $74.80 Regular priceUnit price per$88.00 -
Up to $34 off
In StockInvidia Stock Downpipe to 3in Exhaust Adapter - Universal
Regular price $64.00Sale price $64.00 Regular priceUnit price per$98.00 -
In StockRevel GT Dry Carbon Fuse Box Cover - 1 Piece
Fits: 15-21 WRX/STI
Only 12 leftRegular price $137.75Sale price $137.75 Regular priceUnit price per$137.75
![Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST](http://jdmuscleusa.com/cdn/shop/products/invidia-r400-gemini-single-layer-quad-titanium-tip-cat-back-exhaust-subaru-wrx-sti-2015-2020-hs15stigm4st-cat-back-exhaust-system-invidia-invhs15stigm4st.jpg?v=1614517010&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Titanium Quad Tip Exhaust | HS15STIGM4ST](http://jdmuscleusa.com/cdn/shop/products/invidia-r400-gemini-single-layer-quad-titanium-tip-cat-back-exhaust-subaru-wrx-sti-2015-2020-hs15stigm4st-cat-back-exhaust-system-invidia-invhs15stigm4st-2.jpg?v=1614675269&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Stainless Steel Quad Tip Exhaust | HS15STIGM4SS](http://jdmuscleusa.com/cdn/shop/products/invidia-r400-gemini-single-layer-quad-ss-tip-cat-back-exhaust-subaru-wrx-sti-2015-2019-hs15stigm4ss-cat-back-exhaust-system-invidia-invhs15stigm4ss.jpg?v=1624333318&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Stainless Steel Quad Tip Exhaust | HS15STIGM4SS](http://jdmuscleusa.com/cdn/shop/files/invidia-gemini-r400-stainless-steel-quad-tip-exhaust-2015-2021-wrx-2015-2021-sti-hs15stigm4ss-966802_626x419_fccd9762-8c71-4dbc-9db0-162821c362c4.jpg?v=1686606167&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)
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](http://jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance.jpg?v=1737769395&width=220)
![Perrin [02-07 WRX / 04-21] STI Recirculating Blow off Valve Red | PSP-TAC-600RD](http://jdmuscleusa.com/cdn/shop/products/perrin-blow-off-valve-kit-recirc-subaru-wrx-02-07-sti-04-20-psp-tac-600rd-blow-off-valves-perrin-performance-2.jpg?v=1737769395&width=220)
![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)
![Invidia [15-21 WRX/STI, 14-17 FXT] N1 Dual Cat Back Exhaust Titanium Tips | HS15STIGTT](http://jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-burnt-titanium-tips-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2019-hs15stigtt-cat-back-exhaust-system-invidia-invhs15stigtt.jpg?v=1614517012&width=220)
![Invidia [15-21 WRX/STI, 14-17 FXT] N1 Dual Cat Back Exhaust Titanium Tips | HS15STIGTT](http://jdmuscleusa.com/cdn/shop/products/invidia-dual-n1-burnt-titanium-tips-cat-back-exhaust-subaru-wrx-sti-sedan-2015-2019-hs15stigtt-cat-back-exhaust-system-invidia-invhs15stigtt-2.jpg?v=1614675271&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)
![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)
![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)
