2.5 certainly won't limit a 360 in any way.
It won't limit most BB's either. I think with a 440 or so, 3" starts to become more usable, but still not a necessity. Take it with a grain of salt, though. It run 3" on my car....LOL
BUT I use 2.5" tailpipes from the flowmasters.
FWIW, I...