What's wrong with stock?anything but stock.
x2 on what` KC stated !What's wrong with stock?
I know there are penty of opinions, but if you want more sound, your cheapest option would be to drill a few holes in the back plate of the stock exhaust and keep the Goat's belly for a nice rumble sound that won't wake the neighbors or drive you nuts on the highway.
if it's looks you are after, then aftermarket is the way to go...but limited and generally pricy.
My apologies ahead of time for possibly starting another debate about loud pipes....lol