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Very interesting.
I love my perrin 2.5 catback but there is considerable resonance in the cabin (not sure I would call it drone) between 2.5K and 3.5K rpm both on accel/decel, which is the range I'm always in for city driving. Totally quiet at idle and highway cruising. Significantly more resonance than my magnaflow CB ever had.
Ordered some hangers as someone else has noted it improved the resonance a bit. Will report back once I have them installed!
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