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    SEI was conceived at a time when dealers and consumers alike were seeking an aftermarket alternative to high-priced sterndrives and lower units. Since its inception, SEI has been making great strides in the industry — from the first introduction of the SE106™ replacement drive for Mercruiser® Alpha One® in 2004 to a full line of parts and electrical marine products available today. Each and every milestone is a testament to the positive feedback we receive, which in turn pushes us to do more and further our continued growth. In the end, it's about keeping customers happy and giving them more of what they are looking for.

    In 2004 Sterndrive Engineering® introduces its first product to market, the SE106™ Complete Replacement Drive for the Mercruiser®Alpha One® with a One Year Warranty. Keeping its forward motion to change the industry, In 2005 SEI provides its customers with a SE116™ Complete Replacement Drive for the Mercruiser® Gen II with a One Year Warranty. As if it couldn't get better, in 2006 SEI® introduces the Complete Counter Rotation for the SE106™ & SE116™.

    2007 SEI® started the year off with a bang by offering a З-Year Fault Free Warranty on all their Complete Sterndrives & Lower Units. SE121™ Bravo One® Replacement drive introduced to the market. Sterndrive Engineering® is now known as SEI® Marine Products.

    SEI began introducing O/B Lower Units in 2008 for Mercury®, Johnson/Evinrude®, Yamaha®, Honda® and continues to expand its offering.

    In late 2009, SEI® gave its customers what they were asking for, an affordable replacement for their Cobra® Drives. With its OMC® Cobra® to SE116™ Conversion Kit, consumers can replace their aging Cobra Drives with a current style drive that has readily available spare parts.

    In 2011, SEI produced its first big catalog featuring an expanded line of Replacement Parts and an easy-to-use Lower Unit Application Guide for dealers to find what they need quickly. This is also the year SEI® goes international at the METS Show in Amsterdam.

    2013 marks 10 years since Sterndrive Engineering® (SEI®) opened its doors. Today, SEI® has expanded to become the world's largest supplier of aftermarket sterndrives and outboard lower units in all 50 states and in 50 countries.


    SEI® expands its product line into rotating electrical marine parts by acquiring API Marine® (API®) located in Ft. Lauderdale, Florida. Since 1963, The API Marine® name is synonymous with high quality starters, alternators, power trim motors and hydraulic hatch lifting systems.

    In 2014 SEI began selling theAPI4000 Scan Tool - this was awarded a "Boating Industry Top Product in 2015".


    We are working on a couple of Top Secret Projects that are so Big and "Hush Hush" we can't even reveal what they are. We think they are going to turn the Aftermarket Marine Industry upside down.

    OUR MISSION STATEMENT SEI’s mission is to make owning, operating and maintaining a sterndrive more affordable.

    Only New
    at SEI

    Simply put, buying a remanufactured drive is risky.

    Common practices in the industry include reusing critical wear parts such as cases, gears, shafts and bearings. Inspecting these parts to determine a reasonable expected remaining life is nearly impossible. Consequently, premature failures are common.

    Why risk relying on used and possibly worn out parts when you can buy a brand new drive from SEI for less money?

    Tested, Tested
    &Tested Again

    Sterndrive Engineering has spent 18 months and 10's of thousands of dollars on product testing at the company's private research lake in Central Florida. The result is a drive that we can say with 100% confidence works. Add that to our three-year warranty and it's easy to see why SEI is quickly becoming the largest supplier of replacement drives in the world.

    3 Year
    Fault Free Warranty

    SEI's warranty is the best in the industry for anyone considering purchasing a new drive. 3 Year Fault Free Warranty Click here for more details