exhaust exit preference???

[prg machine]

I was wondering what opinions there might be as far as the exit point for dual exhaust for performance, sound, etc. for the following:

old school hot rod style/ tail pipes dump straight down after exiting mufflers and dump underneath the bed....simple set up



side exit in front of rear wheels


traditional rear corner exit


also is there any real difference in the size of tail pipe after the mufflers??