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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![IAG Performance [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] 8mm Thick Phenolic Spacers | IAG - AFD - 3104 - JDMusclePhenolic Thermal Intake Manifold SpacersIAG-AFD-3104](//jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-8mm-thick-phenolic-spacers-iag-afd-3104-4678295.jpg?v=1770327978&width=220)
In StockIAG 8mm Thick Phenolic Spacers
Fits: 02-14 WRX, 04-21 STI, 05-12 LGT, 04-13 FXT
Only 1 leftRegular price $74.99Sale price $74.99 Regular priceUnit price per$74.99 -
In StockIAG 04-21 STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Intake Manifolds | IAG-AFD-2027SL
Only 1 leftRegular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
In StockIAG Subaru STI Big Bore 76mm Throttle Body w/ Electronics & Adapter Package Process West Intake Manifolds
Only 1 leftRegular price $414.99Sale price $414.99 Regular priceUnit price per$414.99 -
In StockIAG 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT 550 Street Cylinder Heads Package | IAG-ENG-H550NE
Only 1 leftRegular price $3,399.99Sale price $3,399.99 Regular priceUnit price per$3,399.99 -
In StockIAG PTFE Fuel Line Kit
Fits: 08-14 WRX, 08-21 STI
Only 1 leftRegular price $499.99Sale price $499.99 Regular priceUnit price per$499.99 -
![ETS [15 - 21 STI] Stock Turbo Piping Kit - JDMuscleIntercooler Piping Kits200-30-ICP-001OEM - 1.75"Stock BOVStock](//jdmuscleusa.com/cdn/shop/products/ets-15-21-sti-stock-turbo-piping-kit-1940460.jpg?v=1770329054&width=220)
In StockETS Stock Turbo Piping Kit
Fits: 15-21 STI
Only 14 leftRegular price From $795.00Sale price From $795.00 Regular priceUnit price per$795.00 -
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Street version | S48003CF - JDMuscleCat Back Exhaust SystemMBRS48003CF](//jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-street-version-s48003cf-1108331.jpg?v=1770329143&width=220)
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Street version | S48003CF - JDMuscleCat Back Exhaust SystemMBRS48003CF](//jdmuscleusa.com/cdn/shop/files/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-street-version-s48003cf-4543361.png?v=1770329144&width=220)
Up to $285.88 off
In StockMBRP 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Street Version
Fits: 15-21 WRX/STI
Only 3 leftRegular price $1,214.99Sale price $1,214.99 Regular priceUnit price per$1,500.87 -
![Remark [15 - 21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Polished Tips | RO - TSVA - D4 - JDMuscleAxle Back ExhaustsremRO-TSVA-D4](//jdmuscleusa.com/cdn/shop/products/remark-15-21-wrxsti-stainless-steel-axle-back-w-double-wall-4-inch-polished-tips-ro-tsva-d4-3491771.jpg?v=1770329774&width=220)
![Remark [15 - 21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Polished Tips | RO - TSVA - D4 - JDMuscleAxle Back ExhaustsremRO-TSVA-D4](//jdmuscleusa.com/cdn/shop/files/remark-15-21-wrxsti-stainless-steel-axle-back-w-double-wall-4-inch-polished-tips-ro-tsva-d4-8083148.jpg?v=1770329774&width=220)
In StockRemark Stainless Steel Axle Back w/ Double Wall 4 Inch Polished Tips
Fits: 15-21 WRX/STI
Only 13 leftRegular price $695.00Sale price $695.00 Regular priceUnit price per$695.00 -
![Mishimoto [08 - 14 WRX / 08 - 21 STI] Silicone Radiator Hose Kit Neon Yellow | MMHOSE - STI - 08NY - JDMuscleRadiator HosesmisMMHOSE-STI-08NY](//jdmuscleusa.com/cdn/shop/products/mishimoto-08-14-wrx-08-21-sti-silicone-radiator-hose-kit-neon-yellow-mmhose-sti-08ny-9748599.jpg?v=1770329892&width=220)
![Mishimoto [08 - 14 WRX / 08 - 21 STI] Silicone Radiator Hose Kit Neon Yellow | MMHOSE - STI - 08NY - JDMuscleRadiator HosesmisMMHOSE-STI-08NY](//jdmuscleusa.com/cdn/shop/products/mishimoto-08-14-wrx-08-21-sti-silicone-radiator-hose-kit-neon-yellow-mmhose-sti-08ny-3106639.jpg?v=1770329892&width=220)
Up to $16.05 off
In StockMishimoto Silicone Radiator Hose Kit Neon Yellow | MMHOSE-STI-08NY
Fits: 08-14 WRX / 08-21 STI
Only 6 leftRegular price $155.95Sale price $155.95 Regular priceUnit price per$172.00 -
Up to $70.57 off
In StockGSC Power-Division Single Beehive Valve Spring Set w/ Titanium Retainers Subaru Models | inc. 2002-2014 WRX / 2004+ STI
Only 17 leftRegular price $399.92Sale price $399.92 Regular priceUnit price per$470.49 -
![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](//jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-3642986.png?v=1770329895&width=220)
![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](//jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-9137942.png?v=1770329896&width=220)
Up to $133.05 offMishimoto Stainless Steel Cat-Back Exhaust
Fits: 15-21 WRX/STI
Regular price $1,326.95Sale price $1,326.95 Regular priceUnit price per$1,460.00 -
In StockCOBB EJ Turbo Blanket - Black Lava
Fits: 02-14 WRX, 04-21 STI, 09-10 2.5 GT, 04-13 Forester XT, 05-09 Legacy/Outback XT
Only 6 leftRegular price $217.00Sale price $217.00 Regular priceUnit price per$217.00 -
In StockIAG 02-14 WRX / 04-21 STI / 05-12 LGT / 05-09 Outback XT / 04-13 FXT Stage 2 CNC Ported 11mm Oil Pump | IAG-ENG-2240
Only 1 leftRegular price $479.99Sale price $479.99 Regular priceUnit price per$479.99 -
In StockIAG Performance 02-14 WRX / 04-21 STI / 05-09 LGT / 04-13 FXT Oil Control Baffle / Windage Tray Combo | IAG-ENG-2087
Only 2 leftRegular price From $199.99Sale price From $199.99 Regular priceUnit price per$199.99 -
Up to $20 off
In StockIAG Garret GT Series Turbo Oil Feed Line & AVCS Line for Subaru Multiple Fitments
Only 1 leftRegular price From $119.99Sale price From $119.99 Regular priceUnit price per$136.36 -
IAG Stage 2 2.5L Subaru Short Block for Subaru Multiple Fitments
Regular price $4,955.41Sale price $4,955.41 Regular priceUnit price per$3,925.98
![IAG Performance [02 - 14 WRX, 04 - 21 STI, 05 - 12 LGT, 04 - 13 FXT] 8mm Thick Phenolic Spacers | IAG - AFD - 3104 - JDMusclePhenolic Thermal Intake Manifold SpacersIAG-AFD-3104](http://jdmuscleusa.com/cdn/shop/files/iag-performance-02-14-wrx-04-21-sti-05-12-lgt-04-13-fxt-8mm-thick-phenolic-spacers-iag-afd-3104-4678295.jpg?v=1770327978&width=220)
![ETS [15 - 21 STI] Stock Turbo Piping Kit - JDMuscleIntercooler Piping Kits200-30-ICP-001OEM - 1.75"Stock BOVStock](http://jdmuscleusa.com/cdn/shop/products/ets-15-21-sti-stock-turbo-piping-kit-1940460.jpg?v=1770329054&width=220)
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Street version | S48003CF - JDMuscleCat Back Exhaust SystemMBRS48003CF](http://jdmuscleusa.com/cdn/shop/products/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-street-version-s48003cf-1108331.jpg?v=1770329143&width=220)
![MBRP [15 - 21 WRX/STI] 3inch Cat Back Dual Split Rear Exit T304 with Carbon Fiber Tips Street version | S48003CF - JDMuscleCat Back Exhaust SystemMBRS48003CF](http://jdmuscleusa.com/cdn/shop/files/mbrp-15-21-wrxsti-3inch-cat-back-dual-split-rear-exit-t304-with-carbon-fiber-tips-street-version-s48003cf-4543361.png?v=1770329144&width=220)
![Remark [15 - 21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Polished Tips | RO - TSVA - D4 - JDMuscleAxle Back ExhaustsremRO-TSVA-D4](http://jdmuscleusa.com/cdn/shop/products/remark-15-21-wrxsti-stainless-steel-axle-back-w-double-wall-4-inch-polished-tips-ro-tsva-d4-3491771.jpg?v=1770329774&width=220)
![Remark [15 - 21 WRX/STI] Stainless Steel Axle Back w/ Double Wall 4 Inch Polished Tips | RO - TSVA - D4 - JDMuscleAxle Back ExhaustsremRO-TSVA-D4](http://jdmuscleusa.com/cdn/shop/files/remark-15-21-wrxsti-stainless-steel-axle-back-w-double-wall-4-inch-polished-tips-ro-tsva-d4-8083148.jpg?v=1770329774&width=220)
![Mishimoto [08 - 14 WRX / 08 - 21 STI] Silicone Radiator Hose Kit Neon Yellow | MMHOSE - STI - 08NY - JDMuscleRadiator HosesmisMMHOSE-STI-08NY](http://jdmuscleusa.com/cdn/shop/products/mishimoto-08-14-wrx-08-21-sti-silicone-radiator-hose-kit-neon-yellow-mmhose-sti-08ny-9748599.jpg?v=1770329892&width=220)
![Mishimoto [08 - 14 WRX / 08 - 21 STI] Silicone Radiator Hose Kit Neon Yellow | MMHOSE - STI - 08NY - JDMuscleRadiator HosesmisMMHOSE-STI-08NY](http://jdmuscleusa.com/cdn/shop/products/mishimoto-08-14-wrx-08-21-sti-silicone-radiator-hose-kit-neon-yellow-mmhose-sti-08ny-3106639.jpg?v=1770329892&width=220)
![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](http://jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-3642986.png?v=1770329895&width=220)
![Mishimoto [15 - 21 WRX/STI] Stainless Steel Cat Back Exhaust | MMEXH - WRX - 15 - JDMuscleCat Back Exhaust SystemMIMMMEXH-WRX-15](http://jdmuscleusa.com/cdn/shop/products/mishimoto-15-21-wrxsti-stainless-steel-cat-back-exhaust-mmexh-wrx-15-9137942.png?v=1770329896&width=220)
