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Every track is different as far as limits and enforcement go. For northern California, they now have 103db limits at Sonoma and Thunderhill. Laguna Seca is the worst, with each date getting a different sound limit; most dates are stuck at 90db-93db, and the county doles out a select few (incl. ALMS, Moto GP) at 105db. So glad they built golf course homes near a classic race track!
I had my Spec Boxster sound-checked at Laguna Seca with no cats and the Boxster S muffler, and it was 87db. The louder systems can exceed 103db, but most people get mufflers designed to stay well within the 103db limit, but have run into trouble with some systems that have filler that degrades over time and gets louder. Lucky folks who go places with no limits get straight pipes!
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