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Old 10-18-2016, 11:28 AM   #2
thstone
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
Here is my experience;

For 90dB, I run the test pipes and the stock muffler.

For 94dB, I run the test pipes and the Top Speed Pro 1 or equivalent eBay muffler (which is quite a bit lighter than the stock muffler).

When it comes to sound levels, your mileage may vary.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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