Wiseco (VT2764) 3.875" Bore 9.5:1 Compression Ratio Domed Forged Piston Kit with Top End Gasket Fits: All Harley-Davidson Twin Cam 88 engines 1999-2006 95 cubic inch (1550cc) big bore kit includes 9.5:1 compression ratio domed pistons, rings, circlips, chrome piston pins, and top end gaskets Cylinder boring required, fuel recalibration necessary Dedicated forgings are used for superior strength to weight ratio utilizing aerospace alloy with a dome designed for improved flame travel and detailed skirt shape and profiles for stability and smooth operation in the cylinder bore Utilizes the new ArmorGlide skirt coating, the ultimate in toughness, lubrication, and bond technology working together to minimize friction, maximize horsepower, providing improved wear resistance