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 Unequal Length Header & Up Pipe for 2002-2014 WRX and 2004-21 WRX STI | IAG-EXT-1000
Regular price $849.99Sale price $849.99 Regular priceUnit price per$849.99 -
In StockIAG EJ Competition Oil Pan Package
Fits: 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT
Only 1 leftRegular price $799.99Sale price $799.99 Regular priceUnit price per$799.99 -
In StockIAG Performance Equal Length Header & Up Pipe for Multiple Subaru Fitments
Only 1 leftRegular price $899.99Sale price $899.99 Regular priceUnit price per$899.99 -
IAG 06-14 WRX / 04-21 STI Air / Oil Separator | AOS V2 Competition to V2 Street Series Conversion Kit | V2 AOS Only | IAG-ENG-7110
Regular price $104.99Sale price $104.99 Regular priceUnit price per$104.99 -
Up to $28.50 off
In StockTurbosmart Blow Off Valve Kompact Dual Port Black
Fits: 02-07 WRX, 04-21 STI
Only 8 leftRegular price $256.49Sale price $256.49 Regular priceUnit price per$284.99 -
In StockCobb Tuning Fuel Pressure Regulator for Fuel Rail Kit
Fits: 08-21 STI
Only 18 leftRegular price $380.00Sale price $380.00 Regular priceUnit price per$380.00 -
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](//jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-1209747.jpg?v=1770336437&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](//jdmuscleusa.com/cdn/shop/files/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-5283363.jpg?v=1770336437&width=220)
In StockCobb Tuning SF Intake + Airbox Combo - Black/Blue
Fits: 19-21 STI, 18 STI Type RA
Regular price $575.00Sale price $575.00 Regular priceUnit price per$575.00 -
TR Twin Scroll High Flow Catless Downpipe
Fits: 08-14 WRX, 08-18 STI
Regular price $750.00Sale price $750.00 Regular priceUnit price per$600.00 -
![XForce [08-14 WRX, 08-21 STI] Pro Series Catted Downpipe | ES-SW08-KITB - JDMuscleFront Pipes and Downpipes / J-PipesES-SW08-KITB](//jdmuscleusa.com/cdn/shop/products/xforce-08-14-wrx-08-21-sti-pro-series-catted-downpipe-es-sw08-kitb-4083289.png?v=1783899632&width=220)
Up to $79.90 off
In StockXForce Pro Series Catted Downpipe | ES-SW08-KITB
Fits: 08-14 WRX, 08-21 STI
Only 10 leftRegular price $719.10Sale price $719.10 Regular priceUnit price per$799.00 -
In StockETS Front Mount Intercooler Core Only | 15-21 Subaru STI
Regular price From $759.00Sale price From $759.00 Regular priceUnit price per$759.00 -
In StockETS 15-17 STI Cold Air Intake Kit | 15-STI-Intake
Only 6 leftRegular price From $295.00Sale price From $295.00 Regular priceUnit price per$295.00 -
In StockProthane Universal Super Grease - 0.5oz Pack of 3 - Red
Regular price $11.00Sale price $11.00 Regular priceUnit price per$11.00 -
![Turbo XS [15-21 WRX/STI] Billet Aluminum Radiator Stay - Blue - JDMuscleRadiator AccessoriestxsW15-RADSTAY-BLU](//jdmuscleusa.com/cdn/shop/products/turbo-xs-15-21-wrxsti-billet-aluminum-radiator-stay-blue-7529076.jpg?v=1789269553&width=220)
![Turbo XS [15-21 WRX/STI] Billet Aluminum Radiator Stay - Blue - JDMuscleRadiator AccessoriestxsW15-RADSTAY-BLU](//jdmuscleusa.com/cdn/shop/products/turbo-xs-15-21-wrxsti-billet-aluminum-radiator-stay-blue-3032793.png?v=1789269553&width=220)
Up to $8.21 off
In StockTurbo XS Billet Aluminum Radiator Stay - Blue
Fits: 15-21 WRX/STI
Only 8 leftRegular price $44.00Sale price $44.00 Regular priceUnit price per$52.21 -
Up to $511.42 off
In StockTurbo XS FMIC 15-21 Subaru STi - Wrinkle Black Pipes | STI15-FMIC-BLK
Only 1 leftRegular price $1,445.00Sale price $1,445.00 Regular priceUnit price per$1,956.42 -
Up to $233.33 off
In StockSnow Performance Gas Stage 2 The New Boost Cooler Forced Induction Water/Methanol Injection Kit - Universal
Regular price $583.34Sale price $583.34 Regular priceUnit price per$816.67 -
In StockKartboy Battery Tie Down | KB-100-BT
Fits: Most Subaru Models
Regular price $45.00Sale price $45.00 Regular priceUnit price per$45.00
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](http://jdmuscleusa.com/cdn/shop/products/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-1209747.jpg?v=1770336437&width=220)
![COBB [19 - 21 STI, 18 STI Type RA] SF Intake + Airbox Combo - Black/Blue | SUB00002IA - JDMuscleIntakescobbSUB00002IA-BKBlack](http://jdmuscleusa.com/cdn/shop/files/cobb-19-21-sti-18-sti-type-ra-sf-intake-airbox-combo-blackblue-sub00002ia-5283363.jpg?v=1770336437&width=220)
![XForce [08-14 WRX, 08-21 STI] Pro Series Catted Downpipe | ES-SW08-KITB - JDMuscleFront Pipes and Downpipes / J-PipesES-SW08-KITB](http://jdmuscleusa.com/cdn/shop/products/xforce-08-14-wrx-08-21-sti-pro-series-catted-downpipe-es-sw08-kitb-4083289.png?v=1783899632&width=220)
![Turbo XS [15-21 WRX/STI] Billet Aluminum Radiator Stay - Blue - JDMuscleRadiator AccessoriestxsW15-RADSTAY-BLU](http://jdmuscleusa.com/cdn/shop/products/turbo-xs-15-21-wrxsti-billet-aluminum-radiator-stay-blue-7529076.jpg?v=1789269553&width=220)
![Turbo XS [15-21 WRX/STI] Billet Aluminum Radiator Stay - Blue - JDMuscleRadiator AccessoriestxsW15-RADSTAY-BLU](http://jdmuscleusa.com/cdn/shop/products/turbo-xs-15-21-wrxsti-billet-aluminum-radiator-stay-blue-3032793.png?v=1789269553&width=220)
