Ummm... well besides sound and exhaust smell there is this very poisonous gas that is emitted called CARBON MONOXIDE. Ever heard of it? Don't need my family dieing from it on a road trip, ya know?
I just threw on a cpl thrush turbo mufflers from autozone. I stepped the stock 1.5" pipes up to 2" and got a cpl cheap stainless tips off ebay. Sounds nice. Not loud but at least now can hear it running!!