OK thanks for all the help ....I was just the successful bidder on a complete exhaust system " National Chevy assoc. " Williams Headers ,all the pipe hangers everything , If u want to look it up e-bay 221374238050 .its for a sedan , I talked to them and they are going to swap it to a 1954 truck . They have exhaust systems for cars and trucks 49-54 ,I,m getting a set of Fenton headers as soon as the seller gets home Monday , he claims they are new, never used and are 40 years old ....How can I tell the old ones from new Fenton pops ???? And how much difference in the williams and the Fentons ????