Yes, it was on my 2000S when I purchased it @ 30K miles. Thought it was the stock muffler for a long time as the tips look like stock.
Yes, it does have a resonance between 2500-2900 RPM. Below that it growls and above that it sings!
I have read that the removal of the CAT pipes can improve the resonance but cant comment as my system is stock.
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