I guess I did things cheep back when my 57 and my 64 I weled a pc. of 2" galvinized pipe threaded on one end to my exhaust pipe and had a 2" cap with a short bar welded to it for lake dumps. I was going down the toll road with regular lakers with them 1/2 open when I got where I was going 200+ mi. the part of the cap that covered the pipe had burned off had to buy new caps.