i have the Banks system, the slightly louder then stock... no muffler is the difference. i have found that it is just a little louder if at all. it was 300 or so cheaper with out the muffler which is supposed to make it quieter then stock.
2005 Silverado 2500HD CC 4X4 5-speed Allison KD transfer case upgrade Reflex Spray in Bed coating, Access tonneau cover, Banks Ottomind 6 Tuner with Power PDA, Banks Monster exhaust,Banks Ram air intake. Ultrastart remote starter,Blistein shocks,Mag-hytech deep trans pan, Pulling 1982 27.5 ft Golden Falcon TT 275,000 kms