I wanna run a 4-1 header from DC or something but I don't know what size collector to get with it. I plan on having a Hi-flo cat and cat-back exhaust soon afterward.

Also, whats a good size exhaust to run an all motor application well? Im thinkin a solid 2.25 from collector-back. Thats why i need to know what size collector to use and what size exhaust runs well. Most ill prob do is I/H/E, stage 2 cams, itr pistons, match port, etc. thanks