I got some questions about the fmf power core silencer I'm listing on here. It came from my 88' and a guy wants to put it on his 86'. However MY 86' has one mount on the body, and the 88' has 2 mounts on it. The holes on both power cores do not match up. Does he need the 86' power core or will the 88' work just the same? He told me he is using a dg pipe I believe.