Can anyone tell me the difference between the 1995 454 and the 1996-1999 454 as far as headers are concerned? I have a 1999 C2500 2WD 454 and I'm about to pull the exhaust manifolds off. When I do I would like to replace them with headers, but the ones for a 1999 can blow the whole budget. Anyone with experience in the matter and wanting to share their knowledge and advice?