Exhaust size is only as good as the smallest part it has to go through..
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1998 Dodge 2500 Cummins 5 Spd SB clutch
MODS: AEM intake, 4in TB, gauges,3in intake horn ,bd-boostfooler,DDP 110's, ARP studs, Superchips, Aurora 3000 FASS 95, and Vulcan draw straw II