I have mac long tube headers with 3 inch collectors,My buddy has a set of magnaflows with all the pipe work he is going to give them to me,the problem is they have the 3 bolt flange were they hook up to the headers,my headers have the ball flange,and the pipe thats on the mufflers is 3 inch what would be the easiest way to adapt i want to do it my self can i adapt 3 inch pipe to 3 inch collectors please help.