I also run the new 50 series SUV-Performance Flowmaster single 2 1/2 in and
dual 2 1/4 out. Model number 525552. It sounds great and the resonance in
the cab is minimal/unnoticable. The 70 series is just to big for the 4.7
although you could run it and there is room for it. I seem to remember that
there is a sound file on the net somewhere. I'll try to dig it up for you
and at least you can hear the 70 series on a 4.7.
Andrew
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