My muffler guy, took the muffler off my sons 75 olds and all he has now is a stock GM cat. The cat is one of the old big ones. The car is surprisingly quite. Sure it is somewhat louder than with a muffler, but not that much. The car also runs better. I wonder if anyone has just run a D with a cat and long pipes with no muffler. The pipes muffle the noise but provide very little restriction. This still legal from an emission viewpoint. Bob To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/