There is a comprehensive article on Sound in the April 2014 SportsCar that I recommend to all racers, but especially to those planning to attend the Big Race in October.
One thing I will add is that not all sound comes out the tailpipe. If your car races near the limit, be sure your crew checks for aero whistle, groans and whines from the driveline and rattles or vibrations from the engine compartment. Rarely that last 1/2 dBA comes from a place you would not think about.
Lastly, if you think you are near the limit be sure you pass the mic by yourself a time or two during P&Q so an accurate reading will appear on the sound reports.
National license - Sound Control - since the 90s.
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