Use a 3" straight through style muffler. I prefer the Dynomax UltraFlow.
The Dynomax Super Turbos are real popular b/c they're pretty quiet, but they kill a lot of power.
The Hooker Aerochamber is nice also. A lil quieter than the Ultra Flow, but flows MUCH better than the Super Turbos.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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