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my dually has turbo glass packs they have a good sound to them heres a link to a youtube video i did that has it running its queit when going down the road but when u hit the gas they wake up my friend can hear me from half a mile a wayu which is the end of our street if i rev the motor its not to loud it draws attention from cops"aka the dounut eating pigs" lol but it is a good start if u havent decided yet. also i have a 366 big block with true dual and extended tube headers it might be quieter on you vehicle since you would have to have catgs to pass inspection http://www.youtube.com/watch?v=0bemENViwwQ