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AEM Electronics Water/Methanol Injection Filter Cadillac D-BM-41 BMW E 34 8AEM Electronics Water Methanol Injection Filter Their filters not only protect the internals of your engine, but the working components of the water methanol pump as well! Your AEM injection kit is a great, low cost way to increase the power of your gas or diesel engine, and using their water methanol injection filters will help to increase pump life. Built from rugged polypropylene, these filters are easy to install, completely serviceable, and fit