I have 4" H pipe system that dumps at the axle on my cuda w/ Hooker Max Flow mufflers. They are a straight through style muffler and are surprisingly quiet.
WAY quieter than I expected them to be. Been 5.60 at 126 in the 1/8 with them at nearly 3900 lbs.

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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