[Ant]

Kevin,

I think with 3.5" OD that gives a good amount of size, and you are probably right your Big block has substantial horsepower and may benefit from large mufflers. My understanding was with race cars they went big in the whole system depending on the rpms used!

Mild steel is good when ceramic coated and the advantage of cooler areas surrounding the where the exhaust goes, my pipes rusted bad after the dyno run but are now coated so should be ok for a few years - might see me out who knows!