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Sounds like you are getting the dreaded muffler drone that many suffer from.
My mufflers (TopSpeed Exhaust and 2nd cat delete pipe) had that same 2,500-3,000 drone until I removed the 2nd Catalytic converter just before the muffler.
The droning was gone immediately and the exhaust sounds incredible now.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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