K&P Engineering S44 PCBE Black Powder Coat With Buffed Edges Lifetime Oil Filter for Harley Davidson Motorcycles Billet aluminum filter case doubles as an oil cooler No more oily paper filters to the landfills Has 22% more cooling surface and 14% more oil capacity than the S4 version Magnetic Prefiltering Progressive rate bypass combined with high flow characteristics of the filter media avoids unfiltered oil bypassing the filter during cold startup and high rpm