Dynomax Super Turbos are restrictive as he11 and definitely hurt power!
I like Flowmasters personally, but know a lot don't.
Never seen the performance drop from Flowmasters a lot claim though. Had a set of 3" 40 series Flowmasters on my cuda w/ a 440 that ran 11.40s in the 1/4 and it ran the same w/ the mufflers or without them.
The Dynomax Ultra Flow, Hooker Max Flow, or Hooker Aerochamber are very good flowing and sounding mufflers too.
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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