SKU: M45-1009 M45 Stage 1.5 EJ25 Short Block for WRX, STI, Legacy GT, and Forester XT

EJ25 Perfected

The turbocharged EJ25 engines, especially the EJ257, have become iconic in the automotive world. Known for their power, tuning potential, and unique Subaru boxer sound, these engines have played a crucial role in the success of the WRX STI, both in racing and everyday performance.

Say Goodbye to Factory Flaws

• Rod Bearing Failures: Often in modified or high-mileage engines; proper maintenance can help prevent this.
• Ringland Failures: Can occur under high stress or poor tuning.
• Oil Consumption: Some engines may consume oil, requiring regular monitoring.
• Head Gasket Issues: More common in naturally aspirated versions, but can still affect turbo engines, especially if they overheat.

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 short block is a new OEM Subaru Nitride-Treated Crankshaft, designed for peak performance and durability in 2004-21 STI, 2006-14 WRX, 2004-08 Forester XT, and 2005-09 Legacy GT. Built to fit all EJ25 engines, this crankshaft ensures 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, thereby extending the engine's lifespan.

Premium Wiseco Subaru EJ257 WRX/STI Forged Piston Kit

Forged pistons, known for their exceptional strength and wear resistance, add significant value to the engine's performance and overall durability. If it's modified for more power, the stock cast pistons may not be able to withstand the increased stress. This is where forged pistons come in. We have also equipped the engine with high-grade piston rings and seals, improving the engine's compression and oil control.

To Sum It Up

• Seasoned case halves
• New OEM Subaru nitrided crankshaft
• Upgraded Wiseco forged pistons with new piston rings and seals
• Resized connecting rods
• ACL or King hardened rod bearings and main bearings
• Fits WRX 2006-2014, STI 2004-2021, Legacy GT 2005-2009, Forester XT 2004-2013, Outback XT 2005-2009.

Make It Stout With ARP

ARP studs offer precision alignment and are thread-rolled after heat treatment, boosting fatigue strength by 1000%. Despite the higher cost, this process ensures superior durability. Each kit includes premium washers. Essential for performance engines under increased boost, ARP head studs are the top choice for your WRX or STI, providing an option to enhance your engine’s strength.

Warranty

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

Core Charge

Unlike traditional practices, we do not require an up-front core charge when you purchase our product. Instead, we offer a convenient and hassle-free process for returning your old short block, ensuring a smooth transaction for both parties.

By making a purchase from us, you agree to promptly deliver your core (old short block) within 30 days from the date of purchase. It is crucial to adhere to this time frame to avoid any inconveniences. After the 30-day period, failure to return your core will result in the voiding of your warranty and a charge of $1500.

We pride ourselves on our commitment to customer satisfaction and understand that cores may have various issues. Rest assured, we accept your core regardless of its condition, as long as it matches the exact specifications and includes all the parts that originally came with it.

Our streamlined core return process ensures that you can enjoy the benefits of your purchase while fulfilling your responsibility to return the core in a timely manner. We appreciate your cooperation in helping us maintain the quality of our products and guaranteeing a positive experience for all our valued customers.

Freight Shipping

To make the process as straightforward as possible, we charge freight up front for both the outbound shipment of your new short block and the inbound return of your core. This ensures that you know the total shipping cost right from the start, without any surprises.