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I have the Top Speed on my 97 2.5 along with their sport headers. Lots and LOTS of cabin resonance between 2-3k rpm. It's deafening when I must raise the top and windows to poke along in traffic (in the rain or sweltering Houston heat and humidity).
If it were not for the outrageous heat buildup in the trunk and the weight, I'd put the factory muffler back on. And I just might anyway. I've taken my car from stock to a full race suspension and exhaust and now almost back to stock. The Porsche engineers really knew what they were doing when they designed the Boxster.
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