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M45 EJ25 Subaru 2008-2018 WRX STI Premium Remanufactured Long Block
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    Purchase M45 EJ25 Subaru 2008-2018 WRX STI Premium Remanufactured Long Block

    SKU: M45-1001 M45 EJ25 Subaru 2008-2018 WRX STI Premium Remanufactured Long Block

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    M45 Automotive Subaru WRX STI 2008-2018 Premium Remanufactured Long Block

    A remanufactured engine means that the unit has been fully disassembled, cleaned, and inspected, with all worn or defective components replaced with new or refurbished parts. Unlike a simple rebuild, our remanufacturing processes adhere to rigorous standards, making the engine comparable to a brand-new unit in terms of performance, reliability, and lifespan. At the core of our engine-building program, we are fully dedicated to upholding our reputation and delivering the best product possible. For over a decade, we've been building these engines in-house for our local customers with a high success rate. Using only the highest-quality components and specialized machining and assembly techniques, our goal is to create top-notch engines that exceed expectations, offering a like-new performance backed by our meticulous attention to detail.

    To guarantee the longevity of your engine, this long block features an assembled short block with a new OEM nitrided crankshaft, upgraded Wiseco forged pistons, King rod bearings and main bearings, piston rings, seals and resized connecting rods, providing exceptional strength. To ensure perfect alignment, the engine case has been subjected to a Bore and Deck process, matching the pistons in the cylinders and mating surface of the cylinder heads to the case. A torque plate is used during the honing process to further enhance the precision of the case. With the engine case expertly machined, you can rest assured knowing that every component fits seamlessly together.

    The cylinder heads have been resurfaced, the lash adjustment has been set and a valve job has been done. Additionally, new valve guides and valve stems have been added for enhanced durability and performance. The heads are installed with new head gaskets and seals, torqued to factory specifications, and meticulously inspected.

    • Seasoned case halves
    • New OEM Subaru nitrided crankshaft
    • Upgraded Wiseco forged pistons with new piston rings and seals
    • Resized connecting rods
    • King rod bearings and main bearings
    • Six Star 2-ply head gaskets


    M45 Automotive's warranty covers against defects in our workmanship and product for 24 Months or 24,000 Miles (which ever 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 long block, ensuring a smooth transaction for both parties.

    By making a purchase from us, you agree to promptly deliver your core (old long 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 $1250.

    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 of our head 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 engine and the inbound return of your core. This ensures that you know the total shipping cost right from the start, without any surprises.

    Questions? We're Here to Help!

    California Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, please visit www.P65Warnings.ca.gov.