Quote:
Originally Posted by m4a1mustang
Stock cats. It's really just that 2-3k rpm band that gets loud and DEEP that just slices through what little sound deadening we have and kind of rattles your brain a bit.
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I think that's the same resonant frequency of the cabin, so, it's not THAT surprising. Maybe it's less with more flow (ie, it projects it out the tailpipe a bit more / maybe the HFC or RTP is what's "humming"?)