^^^what he said, but it also depends on what tuner you wanna go with. steepybs made 420hp with efilive, air dog2, intake and dual exhaust(yes i know its just a dual outlet). on a stock tranny...but he also doesn't dog his truck...you posted in the lb7 section so i assume thats your powerplant?
CHAD : 2002 CHEVROLET 2500HD ec/sb 4x4: Has enough to help me do the speed limit
30% exergy,s366,alligator stage 5, Idaho rob, arp studs, 6" tuff country 35x12.50 nitto trail grapplers, 17x9 xd spies all work done at home
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5" = deeper sound. 4" = more of that pissed off two owls havin angry sex dmax sound at WOT.