for the chevy L6 they buildem as 123/456 Or you can build like some have in the past and maybe still do and that's all 12 into One.
Yeah measure Twice cut once Tack the pipes Test fit. Once you have them the way you want them Then weldem Up. AND For a Equal lenght Set you want to be as close to 1in as you can get. You don't need a 1 3/4 pipes/(tubes) for the street
1 1/2 - 1 5/8 is pretty much the standered for the street. What motor are you building?
Hope this helps.}[oooooo]
God doesn't like ugly.
