Bolt-in. .445" int. .465" exh. Good bottom end but above 2800 RPM it produces solid performance gains over stock. Free breathing slip-on mufflers / exhaust and air cleaner are recommended for best results. 1850-5950 RPM. High performance cam to work with the stock chain drive system. Compatible with stock length pushrods lifters and valve train components. 17-23 M8