Um Ok ! mine went from 50 to 42 - 44. Tried with the stock muffler drilled at both ends with long extensions and a 25mm ( i think ) uni-bit with one large hole in each end and 4 or 5 smaller holes along side(sounded a bit louder than stock , and a MSR Italian with a DB killer at both ends that is a little louder than the drilled stock and what I consider is perfect. The price is good but freight just went way up.