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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![HKS [08 - 21 STI] Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit | 71008 - KF013VB - JDMuscleBlow Off Valveshks71008-KF013VB](//jdmuscleusa.com/cdn/shop/products/hks-08-21-sti-super-sqv4-blow-off-valve-black-edition-w-suction-return-kit-71008-kf013vb-3903918.jpg?v=1770331689&width=220)
![HKS [08 - 21 STI] Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit | 71008 - KF013VB - JDMuscleBlow Off Valveshks71008-KF013VB](//jdmuscleusa.com/cdn/shop/products/hks-08-21-sti-super-sqv4-blow-off-valve-black-edition-w-suction-return-kit-71008-kf013vb-2517622.jpg?v=1770331689&width=220)
In StockHKS Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit
Fits: 08-21 STI
Only 1 leftRegular price $383.00Sale price $383.00 Regular priceUnit price per$383.00 -
Up to $85.22 off
In StockFluidampr Balanced Damper
Fits: 02-14 WRX, 04-21 STI
Regular price $482.92Sale price $482.92 Regular priceUnit price per$568.14 -
![HKS [02 - 25 WRX/STI, 13 - 21 BRZ/FRS/86] 1.1 Bar Limited Edition Radiator Cap | 15009 - AK004 - JDMuscleRadiator CapsHKS15009-AK004](//jdmuscleusa.com/cdn/shop/products/hks-02-25-wrxsti-13-21-brzfrs86-11-bar-limited-edition-radiator-cap-15009-ak004-2331844.jpg?v=1770332249&width=220)
![HKS [02 - 25 WRX/STI, 13 - 21 BRZ/FRS/86] 1.1 Bar Limited Edition Radiator Cap | 15009 - AK004 - JDMuscleRadiator CapsHKS15009-AK004](//jdmuscleusa.com/cdn/shop/products/hks-02-25-wrxsti-13-21-brzfrs86-11-bar-limited-edition-radiator-cap-15009-ak004-7878472.jpg?v=1770332250&width=220)
In StockHKS 1.1 Bar Limited Edition Radiator Cap
Fits: 02-26 WRX/STI, 13-21 BRZ/FRS/86
Regular price $42.00Sale price $42.00 Regular priceUnit price per$42.00 -
In StockOVERTAKE Adjustable Exhaust Hanger - 12mm
Fits: 08-26 WRX, 08-21 STI, 13-26 BRZ
Regular price From $13.00Sale price From $13.00 Regular priceUnit price per$13.00 -
![Perrin [08-25 WRX/STI, 05-09 LGT, 13-21 BRZ] 12MM Red Exhaust Hanger](//jdmuscleusa.com/cdn/shop/files/c467804d-1bb3-47f2-96a7-efb0a828ce18-420.jpg?v=1756756826&width=220)
![Perrin [08-25 WRX/STI, 05-09 LGT, 13-21 BRZ] 12MM Red Exhaust Hanger](//jdmuscleusa.com/cdn/shop/files/Screenshot_497.png?v=1754682999&width=220)
Up to $4.25 off
In StockPerrin 12MM Red Exhaust Hanger
Fits: 08-25 WRX/STI, 05-09 LGT, 13-21 BRZ
Regular price $12.75Sale price $12.75 Regular priceUnit price per$17.00 -
![Koyo [08-21 WRX/STI, 05-09 LGT] 13mm Coolant Reservoir Adapter - For Part VH091662 | PI-2183 - JDMuscleCoolant and AdditiveskoyPI-2183](//jdmuscleusa.com/cdn/shop/products/koyo-08-21-wrxsti-05-09-lgt-13mm-coolant-reservoir-adapter-for-part-vh091662-pi-2183-6118526.jpg?v=1781013553&width=220)
Up to $4.36 off
In StockKoyo 13mm Coolant Reservoir Adapter - For Part# VH091662 | PI-2183
Fits: 08-21 WRX/STI, 05-09 LGT
Only 3 leftRegular price $17.00Sale price $17.00 Regular priceUnit price per$21.36 -
![Compressive Tuning [22 - 25 WRX, 15 - 21 STI, 19+ Ascent /Outback/Legacy] AirShields - JDMuscleIntercooler ShroudsAS151-EJ-RD2015+ STiWrinkle Red](//jdmuscleusa.com/cdn/shop/products/compressive-tuning-22-25-wrx-15-21-sti-19-ascent-outbacklegacy-airshields-1132894.jpg?v=1770332118&width=220)
![Compressive Tuning [22 - 25 WRX, 15 - 21 STI, 19+ Ascent /Outback/Legacy] AirShields - JDMuscleIntercooler ShroudsAS151-EJ-BK2015+ STiWrinkle Black](//jdmuscleusa.com/cdn/shop/products/compressive-tuning-22-25-wrx-15-21-sti-19-ascent-outbacklegacy-airshields-7350340.jpg?v=1770332118&width=220)
Up to $14 offCompressive Tuning AirShields
Fits: 22-25 WRX, 15-21 STI, 19+ Ascent /Outback/Legacy
Regular price From $121.00Sale price From $121.00 Regular priceUnit price per$135.00 -
![Perrin [02 - 25 WRX, 04 - 21 STI, 13 - 25 BRZ/FRS/86] Oil Fill Cap | PSP - ENG - 711 - JDMuscleOil CapsperPSP-ENG-711RDRed](//jdmuscleusa.com/cdn/shop/files/perrin-02-25-wrx-04-21-sti-13-25-brzfrs86-oil-fill-cap-psp-eng-711-3496812.png?v=1770332363&width=220)
![Perrin [02 - 25 WRX, 04 - 21 STI, 13 - 25 BRZ/FRS/86] Oil Fill Cap | PSP - ENG - 711 - JDMuscleOil CapsperPSP-ENG-711BKBlack](//jdmuscleusa.com/cdn/shop/products/perrin-02-25-wrx-04-21-sti-13-25-brzfrs86-oil-fill-cap-psp-eng-711-4476366.jpg?v=1770332363&width=220)
Up to $22 off
In StockPerrin Oil Fill Cap
Fits: 02-25 WRX, 04-21 STI, 13-25 BRZ/FRS/86
Regular price From $61.50Sale price From $61.50 Regular priceUnit price per$82.00 -
![PLM [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT] Power Driven Up Pipe | PLM-SUB-UP-PIPE-IWG](//jdmuscleusa.com/cdn/shop/products/IMG_1887.jpg?v=1748367040&width=220)
Up to $54 off
In StockPLM Power Driven Up Pipe | PLM-SUB-UP-PIPE-IWG
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT
Only 7 leftRegular price $195.00Sale price $195.00 Regular priceUnit price per$249.00 -
![Invidia [15-21 WRX/STI] Gemini R400 Signature Series Black Tip Quad Tip Exhaust | HS15STIGM4SB](//jdmuscleusa.com/cdn/shop/products/invidia-gemini-r400-single-layer-cat-back-exhaust-w-black-tips-subaru-wrx-sti-2015-2020-hs15stigm4sb-cat-back-exhaust-system-invidia-invhs15stigm4sb.jpg?v=1614552106&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Signature Series Black Tip Quad Tip Exhaust | HS15STIGM4SB](//jdmuscleusa.com/cdn/shop/files/invidia-gemini-r400-signature-series-black-tip-quad-tip-exhaust-2015-2021-wrx-2015-2021-sti-hs15stigm4sb-322756_626x418_6d346b65-3891-4b31-8f79-821032d43d2d.jpg?v=1686694915&width=220)
Up to $835 off
In StockInvidia Gemini R400 Signature Series Black Tip Quad Tip Exhaust
Fits: 15-21 WRX/STI
Only 9 leftRegular price $1,839.00Sale price $1,839.00 Regular priceUnit price per$2,674.00 -
![Perrin [02-07 WRX, 04-21 STI] Throttle Body Hose Red | PSP-ITR-301RD](//jdmuscleusa.com/cdn/shop/products/perrin-top-mount-intercooler-coupler-red-subaru-wrx-2002-2007-sti-2004-2019-psp-itr-301rd-intercooler-hose-kits-perrin-performance-papsp-itr-301rd.jpg?v=1737769454&width=220)
![Perrin [02-07 WRX, 04-21 STI] Throttle Body Hose Red | PSP-ITR-301RD](//jdmuscleusa.com/cdn/shop/products/perrin-top-mount-intercooler-coupler-red-subaru-wrx-2002-2007-sti-2004-2019-psp-itr-301rd-intercooler-hose-kits-perrin-performance-papsp-itr-301rd-2.jpg?v=1737769454&width=220)
Up to $11 off
In StockPerrin Throttle Body Hose Red
Fits: 02-07 WRX, 04-21 STI
Regular price $33.00Sale price $33.00 Regular priceUnit price per$44.00 -
![Koyo [08-21 WRX/STI] 8mm Coolant Reservoir Adapter-For Part VH091662 - JDMuscleOverflow Tanks / Coolant Tank and AccessorieskoyPI-2182](//jdmuscleusa.com/cdn/shop/products/koyo-08-21-wrxsti-8mm-coolant-reservoir-adapter-for-part-vh091662-1575856.jpg?v=1781013553&width=220)
Up to $4.36 off
In StockKoyo 8mm Coolant Reservoir Adapter-For Part# VH091662
Fits: 08-21 WRX/STI
Only 7 leftRegular price $17.00Sale price $17.00 Regular priceUnit price per$21.36 -
Up to $110 offPLM 02-14 WRX/ 04-21 STI Power Driven EWG 2-Bolt Up Pipe with Dump Tube 38mm | Also fits Baja Turbo 2004-2006 / Forester XT 2004-2013 / Legacy GT 2005-2009 / Turbo 1991-1994 / Outback XT 2005-2009 | PLM-SUB-UP-PIPE-EWG-38MM
Regular price $339.00Sale price $339.00 Regular priceUnit price per$449.00 -
Up to $35.65 off
In StockGo Fast Bits TMS Respons Hybrid Blow Off Valve | T9003
Fits: 02-07 WRX, 04-21 STI
Only 11 leftRegular price $320.85Sale price $320.85 Regular priceUnit price per$356.50 -
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Burnt Tips | RO-TTVA-D4](//jdmuscleusa.com/cdn/shop/products/remark-axle-back-exhaust-w-4-inch-double-wall-burnt-tips-subaru-wrx-sti-2015-2020-axle-back-exhausts-remark-ro-ttva-d4.jpg?v=1745512020&width=220)
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Burnt Tips | RO-TTVA-D4](//jdmuscleusa.com/cdn/shop/products/remark-axle-back-exhaust-w-4-inch-double-wall-burnt-tips-subaru-wrx-sti-2015-2020-axle-back-exhausts-remark-ro-ttva-d4-2.jpg?v=1745512020&width=220)
In StockRemark Stainless Steel Axle Back w/ Double Wall 4 Inch Burnt Tips
Fits: 15-21 WRX/STI
Only 2 leftRegular price $755.00Sale price $755.00 Regular priceUnit price per$755.00 -
![Mishimoto [08-15 WRX/STI] Plug-N-Play Aluminum Fan Shroud Kit | MMFS-STI-08P](//jdmuscleusa.com/cdn/shop/products/mishimoto-plug-n-play-aluminum-fan-shroud-kit-subaru-impreza-wrx-sti-2008-2019-radiator-fans-mishimoto-mmfs-sti-08p.jpg?v=1614515244&width=220)
![Mishimoto [08-15 WRX/STI] Plug-N-Play Aluminum Fan Shroud Kit | MMFS-STI-08P](//jdmuscleusa.com/cdn/shop/products/mishimoto-plug-n-play-aluminum-fan-shroud-kit-subaru-impreza-wrx-sti-2008-2019-radiator-fans-mishimoto-mmfs-sti-08p-2.jpg?v=1614515245&width=220)
Up to $33.05 off
In StockMishimoto Plug-N-Play Aluminum Fan Shroud Kit | MMFS-STI-08P
Fits: 08-15 WRX/STI
Only 11 leftRegular price $334.95Sale price $334.95 Regular priceUnit price per$368.00
![HKS [08 - 21 STI] Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit | 71008 - KF013VB - JDMuscleBlow Off Valveshks71008-KF013VB](http://jdmuscleusa.com/cdn/shop/products/hks-08-21-sti-super-sqv4-blow-off-valve-black-edition-w-suction-return-kit-71008-kf013vb-3903918.jpg?v=1770331689&width=220)
![HKS [08 - 21 STI] Super SQV4 Blow Off Valve Black Edition w/ Suction Return Kit | 71008 - KF013VB - JDMuscleBlow Off Valveshks71008-KF013VB](http://jdmuscleusa.com/cdn/shop/products/hks-08-21-sti-super-sqv4-blow-off-valve-black-edition-w-suction-return-kit-71008-kf013vb-2517622.jpg?v=1770331689&width=220)
![HKS [02 - 25 WRX/STI, 13 - 21 BRZ/FRS/86] 1.1 Bar Limited Edition Radiator Cap | 15009 - AK004 - JDMuscleRadiator CapsHKS15009-AK004](http://jdmuscleusa.com/cdn/shop/products/hks-02-25-wrxsti-13-21-brzfrs86-11-bar-limited-edition-radiator-cap-15009-ak004-2331844.jpg?v=1770332249&width=220)
![HKS [02 - 25 WRX/STI, 13 - 21 BRZ/FRS/86] 1.1 Bar Limited Edition Radiator Cap | 15009 - AK004 - JDMuscleRadiator CapsHKS15009-AK004](http://jdmuscleusa.com/cdn/shop/products/hks-02-25-wrxsti-13-21-brzfrs86-11-bar-limited-edition-radiator-cap-15009-ak004-7878472.jpg?v=1770332250&width=220)
![Perrin [08-25 WRX/STI, 05-09 LGT, 13-21 BRZ] 12MM Red Exhaust Hanger](http://jdmuscleusa.com/cdn/shop/files/c467804d-1bb3-47f2-96a7-efb0a828ce18-420.jpg?v=1756756826&width=220)
![Perrin [08-25 WRX/STI, 05-09 LGT, 13-21 BRZ] 12MM Red Exhaust Hanger](http://jdmuscleusa.com/cdn/shop/files/Screenshot_497.png?v=1754682999&width=220)
![Koyo [08-21 WRX/STI, 05-09 LGT] 13mm Coolant Reservoir Adapter - For Part VH091662 | PI-2183 - JDMuscleCoolant and AdditiveskoyPI-2183](http://jdmuscleusa.com/cdn/shop/products/koyo-08-21-wrxsti-05-09-lgt-13mm-coolant-reservoir-adapter-for-part-vh091662-pi-2183-6118526.jpg?v=1781013553&width=220)
![Compressive Tuning [22 - 25 WRX, 15 - 21 STI, 19+ Ascent /Outback/Legacy] AirShields - JDMuscleIntercooler ShroudsAS151-EJ-RD2015+ STiWrinkle Red](http://jdmuscleusa.com/cdn/shop/products/compressive-tuning-22-25-wrx-15-21-sti-19-ascent-outbacklegacy-airshields-1132894.jpg?v=1770332118&width=220)
![Compressive Tuning [22 - 25 WRX, 15 - 21 STI, 19+ Ascent /Outback/Legacy] AirShields - JDMuscleIntercooler ShroudsAS151-EJ-BK2015+ STiWrinkle Black](http://jdmuscleusa.com/cdn/shop/products/compressive-tuning-22-25-wrx-15-21-sti-19-ascent-outbacklegacy-airshields-7350340.jpg?v=1770332118&width=220)
![Perrin [02 - 25 WRX, 04 - 21 STI, 13 - 25 BRZ/FRS/86] Oil Fill Cap | PSP - ENG - 711 - JDMuscleOil CapsperPSP-ENG-711RDRed](http://jdmuscleusa.com/cdn/shop/files/perrin-02-25-wrx-04-21-sti-13-25-brzfrs86-oil-fill-cap-psp-eng-711-3496812.png?v=1770332363&width=220)
![Perrin [02 - 25 WRX, 04 - 21 STI, 13 - 25 BRZ/FRS/86] Oil Fill Cap | PSP - ENG - 711 - JDMuscleOil CapsperPSP-ENG-711BKBlack](http://jdmuscleusa.com/cdn/shop/products/perrin-02-25-wrx-04-21-sti-13-25-brzfrs86-oil-fill-cap-psp-eng-711-4476366.jpg?v=1770332363&width=220)
![PLM [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT] Power Driven Up Pipe | PLM-SUB-UP-PIPE-IWG](http://jdmuscleusa.com/cdn/shop/products/IMG_1887.jpg?v=1748367040&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Signature Series Black Tip Quad Tip Exhaust | HS15STIGM4SB](http://jdmuscleusa.com/cdn/shop/products/invidia-gemini-r400-single-layer-cat-back-exhaust-w-black-tips-subaru-wrx-sti-2015-2020-hs15stigm4sb-cat-back-exhaust-system-invidia-invhs15stigm4sb.jpg?v=1614552106&width=220)
![Invidia [15-21 WRX/STI] Gemini R400 Signature Series Black Tip Quad Tip Exhaust | HS15STIGM4SB](http://jdmuscleusa.com/cdn/shop/files/invidia-gemini-r400-signature-series-black-tip-quad-tip-exhaust-2015-2021-wrx-2015-2021-sti-hs15stigm4sb-322756_626x418_6d346b65-3891-4b31-8f79-821032d43d2d.jpg?v=1686694915&width=220)
![Perrin [02-07 WRX, 04-21 STI] Throttle Body Hose Red | PSP-ITR-301RD](http://jdmuscleusa.com/cdn/shop/products/perrin-top-mount-intercooler-coupler-red-subaru-wrx-2002-2007-sti-2004-2019-psp-itr-301rd-intercooler-hose-kits-perrin-performance-papsp-itr-301rd.jpg?v=1737769454&width=220)
![Perrin [02-07 WRX, 04-21 STI] Throttle Body Hose Red | PSP-ITR-301RD](http://jdmuscleusa.com/cdn/shop/products/perrin-top-mount-intercooler-coupler-red-subaru-wrx-2002-2007-sti-2004-2019-psp-itr-301rd-intercooler-hose-kits-perrin-performance-papsp-itr-301rd-2.jpg?v=1737769454&width=220)
![Koyo [08-21 WRX/STI] 8mm Coolant Reservoir Adapter-For Part VH091662 - JDMuscleOverflow Tanks / Coolant Tank and AccessorieskoyPI-2182](http://jdmuscleusa.com/cdn/shop/products/koyo-08-21-wrxsti-8mm-coolant-reservoir-adapter-for-part-vh091662-1575856.jpg?v=1781013553&width=220)
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Burnt Tips | RO-TTVA-D4](http://jdmuscleusa.com/cdn/shop/products/remark-axle-back-exhaust-w-4-inch-double-wall-burnt-tips-subaru-wrx-sti-2015-2020-axle-back-exhausts-remark-ro-ttva-d4.jpg?v=1745512020&width=220)
![Remark [15-21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Burnt Tips | RO-TTVA-D4](http://jdmuscleusa.com/cdn/shop/products/remark-axle-back-exhaust-w-4-inch-double-wall-burnt-tips-subaru-wrx-sti-2015-2020-axle-back-exhausts-remark-ro-ttva-d4-2.jpg?v=1745512020&width=220)
![Mishimoto [08-15 WRX/STI] Plug-N-Play Aluminum Fan Shroud Kit | MMFS-STI-08P](http://jdmuscleusa.com/cdn/shop/products/mishimoto-plug-n-play-aluminum-fan-shroud-kit-subaru-impreza-wrx-sti-2008-2019-radiator-fans-mishimoto-mmfs-sti-08p.jpg?v=1614515244&width=220)
![Mishimoto [08-15 WRX/STI] Plug-N-Play Aluminum Fan Shroud Kit | MMFS-STI-08P](http://jdmuscleusa.com/cdn/shop/products/mishimoto-plug-n-play-aluminum-fan-shroud-kit-subaru-impreza-wrx-sti-2008-2019-radiator-fans-mishimoto-mmfs-sti-08p-2.jpg?v=1614515245&width=220)