You may very well be right about that but if I was running 3" exhaust and my headers got as small as 2 1/4" at the collector I wouldn't be running them that way. I agree about the cats
Does it really drop down to 2 1/4" with a 3" exhaust? I'm sure the majority of us run 2 1/2" I don't think anyone on here is pulling enough power to justify 3" dual exhaust.
Kurt