I LOVE the sound of flowmasters, but if you want max power...go with some Dynomax, Borla, Magnaflow, etc. straight through type mufflers.  I race mine w/ 4" Dynomax bullets, but street drive it with 4" one chamber flowmasters. The bullets are a little over a tenth quicker and about 1.5 mph faster.  CHIP
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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