IMO, glasspacks are for old, carb V8 engines...If your truck is a manual, it will have that nasty crackly/popping sound between shifts or anytime u rev it up and let off the gas if its an auto...If u want somethin just for loudness then glasspack is the way to go....but if u want it to sound mean and decent, then flowmaster, magnaflow or some other similar brand name muffler is the way to go....but they do come with a price compared to a $30 glasspack.....About $90 for a Flowmaster part # 942041....Its really up to u....Just giving my 2 cents.....