There is something that I don't quite understand about exhaust systems on an inline six. For a 250 Chevy, most people run either headers or twin cast manifolds. That part I can understand from a hi performance standpoint . What I don't get is what I have seen afterward, Y piping into a single exhaust. Is there still a performance gain to be had with only duals part way? Converting to duals all the way back makes sense as does a larger single pipe but to me going to the trouble of split exhaust at the engine into a single pipe seems like a lot of work for no real gain. I am sure that I must be missing something. Any thoughts? Jay 6155
