Hello everyone... Newbie from Amarillo TX here.
'08 Silverado Ext Cab. 5.3L 4x4, 3.73
Current mods...K&N FIPK, Bully Dog programmer (Set to performance). Future mods... Supercharger or Turbo

Is a Magna Flow cat back going to be a big difference over just replacing the muffler? I have a '08 Silverado (New Body). The exhaust is about 2.75 and a mandrel bend (which suprised me when I looked at it). Is a 3.0 tube goint to make a difference in sound/power?