exhaust pipe diameter for a mildly modified 340

ir3333 said
and will a 320 hp 340 only lose a bit of power above 5000 rpm?

I just looked at an engine masters dyno 2.5 vs 3 with mufflers on a 600 hp big block, was a 13 hp and 16 tq different at peak, but did lose a bit more mid high rpm.

To me what mufflers you run will have the biggest impact.