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I have a stainless 5" stainless steel muffled with no cat and it is quiet at highway speeds and any other speeds. All I can hear is whistles from the turbos and some mechanical sounds from under the
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4” is plenty for 500-600 rwhp. A 5” just causes more drone at lower power levels. My 05 had a 4” flo-pro with a 51” Donaldson muffler. Zero, and I really mean zero, drone. That was from i
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I am leaning towards the resonator.
So I been running 5" with a muffler and its sounding old. Back a few years ago I heard people talking about running Catalytic Converters that had a good sound to them. I just find it hard to put a cat on my truck. lol Anybody running them or is it bunk?