Depends on what year if it is older you can straight pipe it! If it is newer like 2005 and up the only thing you can really do on the cheap is take the muffler off and replace is with a pipe! I did that to my 2010 chevy 1500 and sounds nice!!

Glasspacks and dual exhaust, it will be loud.

Route the exhaust pipe ends into the cab - you get all the sound benefit and I don't

buy 3 more horns and you can blow all at one time.