I have a twin chamber aftermarket muffler and like the GHL and others, it has bad cabin resonance. None of the manufacturers will tell you just how much there is until it's too late.
If you want the glorious sound outside, you gotta pay the price inside with noise loud enough to give you a headache.
I think Fabspeed has a good loud muffler that is guaranteed not to have resonance or something of the sort.
Word up.
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