I think with big blocks, 3.5" may help or, not at all ?
Although, I've seen a few dyno sheets that show with 2" primaries, 3" collectors and 3.5" mufflers, really help out so, I'm sure I'll go that route.
Now I have to make up my mind, on either mild steel and have them ceramic coated or stainless. I have a industrial buffer machine that I could polish them myself but, that will take a lot of time. If I could find a business and buy the pipes already polished, that would save a lot of time but, even that would be expensive. The advantage to SS is, longevity versus the ceramic lasting only a hand full of years, before you can't polish them out anymore, like what's happened to mine.
Thank you for the site link.
