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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IAG 1150 Closed Deck Long Block Engine w/ IAG 1150 Heads
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Regular price $18,999.99Sale price $18,999.99 Regular priceUnit price per$18,999.99 -
IAG 1150 Closed Deck Long Block Engine w/ IAG 1150 Heads
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Regular price $18,749.99Sale price $18,749.99 Regular priceUnit price per$18,749.99 -
IAG 1150 Closed Deck Long Block Engine w/ IAG 1150 Heads
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Regular price $18,749.99Sale price $18,749.99 Regular priceUnit price per$18,749.99 -
IAG 1150 Closed Deck Long Block Engine w/ IAG 1150 Heads
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Regular price $18,749.99Sale price $18,749.99 Regular priceUnit price per$18,749.99 -
IAG 1150 Closed Deck Long Block Engine w/ IAG 1150 Heads
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Regular price $18,749.99Sale price $18,749.99 Regular priceUnit price per$18,749.99 -
IAG 1150 Closed Deck Long Block Engine w/ IAG 1150 Heads
Fits: 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT
Regular price $18,999.99Sale price $18,999.99 Regular priceUnit price per$18,999.99 -
IAG PTFE Flex Fuel Line Kit for use w/COBB Flex Fuel Sensor
Fits: 08-14 WRX, 08-21 STI
Regular price $599.99Sale price $599.99 Regular priceUnit price per$599.99 -
Up to $25 offBLOX Racing 04 - 18 STI Mega Flow EJ25 Oil Pick-Up Tube | BXPT-50515
Regular price $100.00Sale price $100.00 Regular priceUnit price per$125.00 -
In StockCobb 6MT Stage 2+ Drivetrain Package w/Weighted Black Knob + White/Stealth Black Lockout
Fits: 04-21 STI
Only 8 leftRegular price $490.00Sale price $490.00 Regular priceUnit price per$490.00 -
Up to $129 off
In StockRevel 11-21 WRX/STi / 08-14 WRX Ultra Ti Single Exit Catback Exhaust | T60188R
Regular price $1,161.00Sale price $1,161.00 Regular priceUnit price per$1,290.00 -
Up to $10.21 off
In StockTorque Solution -12an Breather Oil Cap | Black: Subaru Engines | TS-SU-313-12
Only 1 leftRegular price $62.00Sale price $62.00 Regular priceUnit price per$72.21 -
Mishimoto Cold Air Intake Black Subaru STI 15-21 | MMAI-STI-15WBK
Regular price $539.00Sale price $539.00 Regular priceUnit price per$539.00 -
Up to $23.05 off
In StockMishimoto 08-21 WRX/STI Aluminum Coolant Overflow Tank - Black | MMRT-STI-08BK
Only 7 leftRegular price $233.95Sale price $233.95 Regular priceUnit price per$257.00 -
Mishimoto Top Mount Intercooler Black/Black Subaru STI 2008-21 | STI-08BKBK
Regular price $1,081.00Sale price $1,081.00 Regular priceUnit price per$1,081.00 -
Mishimoto 08-21 STI Top Mount Intercooler Silver w/ Black Hoses | MMTMIC-STI-08SLBK
Regular price $1,081.00Sale price $1,081.00 Regular priceUnit price per$1,081.00 -
![MagnaFlow [15 - 21 WRX/STI] Competition Catback Exhaust | 19361 - JDMuscleCat Back Exhaust SystemMFL19361](//jdmuscleusa.com/cdn/shop/products/magnaflow-15-21-wrxsti-competition-catback-exhaust-19361-5828714.jpg?v=1770329185&width=220)
![MagnaFlow [15 - 21 WRX/STI] Competition Catback Exhaust | 19361 - JDMuscleCat Back Exhaust SystemMFL19361](//jdmuscleusa.com/cdn/shop/products/magnaflow-15-21-wrxsti-competition-catback-exhaust-19361-1544043.jpg?v=1770329186&width=220)
MagnaFlow Competition Catback Exhaust | 19361
Fits: 15-21 WRX/STI
Regular price $1,413.00Sale price $1,413.00 Regular priceUnit price per$1,413.00
![MagnaFlow [15 - 21 WRX/STI] Competition Catback Exhaust | 19361 - JDMuscleCat Back Exhaust SystemMFL19361](http://jdmuscleusa.com/cdn/shop/products/magnaflow-15-21-wrxsti-competition-catback-exhaust-19361-5828714.jpg?v=1770329185&width=220)
![MagnaFlow [15 - 21 WRX/STI] Competition Catback Exhaust | 19361 - JDMuscleCat Back Exhaust SystemMFL19361](http://jdmuscleusa.com/cdn/shop/products/magnaflow-15-21-wrxsti-competition-catback-exhaust-19361-1544043.jpg?v=1770329186&width=220)