I just looked at this muffler. It's different from mine in that it has a pipe that equalizes the pressure between the sides, which may or may not reduce resonance.
I'm betting this thing is going to make your cockpit so loud between 2-3k RPM that you wish you had your previous muffler on the car. Do report to us how much resonance it really has.
As far as the cat bypass, how are you planning to handle the CE lights and/or sensor placement issues?
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