I'm going to be running a set of stainless marine dry pipes they are 4" pipes, looking for a descent set of clamp on mufflers but don't want to break the bank any suggestions.

Got a nice pair of air operated gaffrigs.Clamp on's very very good shape with pump,for 4"pipes list for 1600.00 bucks.Will sell for 650 plush shipping.JOHN

I got the Gibsons.

There is a very nice set of I think Gibsons here on the swap shop a while back. Priced reasonable as well.
Good luck.
John

I've got the gibson's , and man, they are quiet! work very well,
my application needs external flappers though, they're almost
submerged at rest!

I reckon the best around are the IMCO's.There's a set on Ebay right now,going cheap over your way too.