M45 FA20 DIT Premium Remanufactured Long Block for 2015-2021 Subaru WRX

FA20DIT Elevated

Meet the FA20DIT engine: Subaru’s revolutionary powerplant for the 2015 WRX. With direct injection and a front-mounted twin-scroll turbo, it redefines performance, departing from the EJ series' design. The FA20DIT sets a new benchmark for efficiency and power, while the 2021 STI upholds the classic legacy.

Precision Executed

The engine case, using seasoned case halves, has been subjected to a thorough Bore and Deck process. This includes precision boring and honing of the case halves, ensuring perfect fitment and alignment. A torque plate is utilized during the honing process to enhance the precision further, resulting in a flawless engine case that guarantees optimal performance.

Unmatched Durability

At the heart of this long block is a new OEM Subaru crankshaft from a 2015–21 WRX / 2013–20 BRZ, providing a strong foundation for reliability.

The Power of Resized Connecting Rods

Resized connecting rods restore original dimensions, ensuring a precise fit and optimal oil clearance, reducing rod knock risk, and enhancing engine durability. Complementing these are ACL or King hardened rod bearings and main bearings, crucial components that endure high-stress conditions and minimize wear.

Professional Series Wiseco Subaru FA20 WRX/BRZ/FRS Forged Piston Kit

Forged pistons add strength and wear resistance, making them ideal for increased power applications where stock pistons may not withstand the stress. High-grade piston rings and seals improve compression and oil control.

Remanufactured Heads

Cylinder heads are precision resurfaced, lash clearance adjusted, and a complete valve job executed. Upgraded GSC intake valve guide sets with depth stoppers and new valve stems enhance durability. Heads are assembled using JE Pro Seal gaskets and fasteners torqued to factory specifications.

Made Stout with ARP

ARP studs offer precision alignment and are thread-rolled after heat treatment, boosting fatigue strength by 1000%. Essential for performance engines under increased boost, ARP head studs are the top choice for your WRX, increasing your engine’s strength.

To Sum It Up

• Seasoned case halves
• New OEM Subaru crankshaft
• Upgraded Wiseco forged pistons with new piston rings and seals
• Resized connecting rods
• ACL or hardened rod bearings and main bearings
• ARP 2000 head studs
• JE MLS head gaskets
• GSC valve guides
• Valve lash set
• New OEM valve guide seals
• Fits WRX 2015–2021

Warranty

M45 Automotive's warranty covers against defects in workmanship and product for 24 months or 24,000 miles (whichever comes first) from the date of receipt.

Core Charge & Freight Shipping

No up-front core charge is required. Return your old long block within 30 days of receiving your new one to keep your warranty active. Return shipping is charged up front to simplify the process.

If the core is not returned within 30 days, there will be a $1,250 charge and the warranty will no longer be valid. Cores are accepted as long as they match original specs and include the parts that came with it.