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 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 -
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-8076841.jpg?v=1770328225&width=220)
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](//jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-2664053.jpg?v=1770328225&width=220)
In StockGrimmspeed 3-Port Electronic Boost Control Solenoid
Fits: 08-21 STI
Only 1 leftRegular price $190.00Sale price $190.00 Regular priceUnit price per$190.00 -
In StockGrimmSpeed Version 2 Turbo Heat Shield
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Regular price From $110.00Sale price From $110.00 Regular priceUnit price per$110.00 -
![BLOX Racing [15 - 21 WRX/STI] Muffler Delete Kit - Black Tip | BXEX - 51104 - BK - JDMuscleMufflersbloBXEX-51104-BK](//jdmuscleusa.com/cdn/shop/products/blox-racing-15-21-wrxsti-muffler-delete-kit-black-tip-bxex-51104-bk-8741182.png?v=1770331331&width=220)
Up to $36 off
In StockBLOX Racing Muffler Delete Kit - Black Tip
Fits: 15-21 WRX/STI
Only 9 leftRegular price $324.00Sale price $324.00 Regular priceUnit price per$360.00 -
![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 -
![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 18 leftRegular price $383.00Sale price $383.00 Regular priceUnit price per$383.00 -
![PLM [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT] Power Driven Up Pipe - JDMuscleTurbo UppipesPLM-SUB-UP-PIPE-IWG](//jdmuscleusa.com/cdn/shop/products/plm-02-14-wrx-04-21-sti-04-13-fxt-05-09-lgt-05-09-obxt-power-driven-up-pipe-7621915.jpg?v=1786515611&width=220)
Up to $54 off
In StockPLM Power Driven Up Pipe
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT
Only 8 leftRegular price $195.00Sale price $195.00 Regular priceUnit price per$249.00 -
![Go Fast Bit [02-07 WRX, 04-21 STI] Hybrid Dual Outlet Blow Off Valve | T9203](//jdmuscleusa.com/cdn/shop/products/go-fast-bits-hybrid-dual-outlet-valve-02-07-subaru-wrx-04-20-sti-05-08-fxt-t9203-blow-off-valves-go-fast-bits-gfbt9203.jpg?v=1614545897&width=220)
Up to $26.09 off
In StockGo Fast Bit Hybrid Dual Outlet Blow Off Valve
Fits: 02-07 WRX, 04-21 STI
Only 14 leftRegular price $234.81Sale price $234.81 Regular priceUnit price per$260.90 -
Up to $35.65 off
In StockGo Fast Bits TMS Respons Hybrid Blow Off Valve
Fits: 02-07 WRX, 04-21 STI
Only 5 leftRegular price $320.85Sale price $320.85 Regular priceUnit price per$356.50 -
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 -
![Cobb [06-14 WRX, 04-21 STI, 05-09 LGT, 04-08 FXT] Spark Plug Set One Step Colder | D44700](//jdmuscleusa.com/cdn/shop/products/b1aa4f1627c975827869c09c78278c4e.jpg?v=1660655055&width=220)
![Cobb [06 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] Spark Plug Set One Step Colder - JDMuscleSpark PlugscobbD44700](//jdmuscleusa.com/cdn/shop/files/cobb-06-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-spark-plug-set-one-step-colder-1998864.jpg?v=1770330674&width=220)
In StockCOBB 2.5L Spark Plug Set - One Step Colder
Fits: 04-14 WRX, 04-21 STI, 05-09 Legacy GT/Outback XT, 04-13 Forester XT
Regular price $68.00Sale price $68.00 Regular priceUnit price per$68.00 -
![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 -
![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 2 leftRegular price $17.00Sale price $17.00 Regular priceUnit price per$21.36 -
![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 2 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 -
![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 5 leftRegular price $755.00Sale price $755.00 Regular priceUnit price per$755.00
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-8076841.jpg?v=1770328225&width=220)
![Grimmspeed [08 - 21 STI] 3 - Port Electronic Boost Control Solenoid | 057007 - JDMuscleBoost Control Solenoidsgrm057007](http://jdmuscleusa.com/cdn/shop/files/grimmspeed-08-21-sti-3-port-electronic-boost-control-solenoid-057007-2664053.jpg?v=1770328225&width=220)
![BLOX Racing [15 - 21 WRX/STI] Muffler Delete Kit - Black Tip | BXEX - 51104 - BK - JDMuscleMufflersbloBXEX-51104-BK](http://jdmuscleusa.com/cdn/shop/products/blox-racing-15-21-wrxsti-muffler-delete-kit-black-tip-bxex-51104-bk-8741182.png?v=1770331331&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)
![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)
![PLM [02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT, 05-09 OBXT] Power Driven Up Pipe - JDMuscleTurbo UppipesPLM-SUB-UP-PIPE-IWG](http://jdmuscleusa.com/cdn/shop/products/plm-02-14-wrx-04-21-sti-04-13-fxt-05-09-lgt-05-09-obxt-power-driven-up-pipe-7621915.jpg?v=1786515611&width=220)
![Go Fast Bit [02-07 WRX, 04-21 STI] Hybrid Dual Outlet Blow Off Valve | T9203](http://jdmuscleusa.com/cdn/shop/products/go-fast-bits-hybrid-dual-outlet-valve-02-07-subaru-wrx-04-20-sti-05-08-fxt-t9203-blow-off-valves-go-fast-bits-gfbt9203.jpg?v=1614545897&width=220)
![Cobb [06-14 WRX, 04-21 STI, 05-09 LGT, 04-08 FXT] Spark Plug Set One Step Colder | D44700](http://jdmuscleusa.com/cdn/shop/products/b1aa4f1627c975827869c09c78278c4e.jpg?v=1660655055&width=220)
![Cobb [06 - 14 WRX, 04 - 21 STI, 05 - 09 LGT, 04 - 08 FXT] Spark Plug Set One Step Colder - JDMuscleSpark PlugscobbD44700](http://jdmuscleusa.com/cdn/shop/files/cobb-06-14-wrx-04-21-sti-05-09-lgt-04-08-fxt-spark-plug-set-one-step-colder-1998864.jpg?v=1770330674&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)
![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)
![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)