I am having a nasty resonance with the flow master transverse muffler at 40mph. I am thinking of changing it for just that reason, at times I like it, but most of the time now I either slow down or speed up to get past it. I seen several flow numbers for flowmaster vs other mufflers, and the flowmaster look to flow much less, in some instances less than 50%. Hard to believe it can be that bad. The ultra flows seem to flow exceptionally well, but I am a little concerned with true duals fitting without scrapping as my car sits lower than stock. I didn't know how the Pypes transverse muffler flowed with the race pro muffler, which seems to be closer to 2 single pipes in a single package. I like the ultra flow dual setup.
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