Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression, this is a bolt-in cam set for stock or mildly modified touring bikes, More power across the rpm range, with improved low and midrange torque, strongest from 1,000-4,000 rpm, Cams for '06 Dyna and '07-'17 Twin Cam are for use with models with hydraulic tensioner chain drive system, Made in the USA, Not recommended for compression ratios of 10:1 or greater., Installer must check coil bind, valve to valve clearance and valve to piston clearance.