My two cents, not that anyone asked...
The screwed up thing about Laguna is that while there is a sound limit, you can PAY for a loud day and gain a few more decibels. Apparently the locals care about noise levels, but if you're willing to pay to inconvenience their ears, well that's okay.
All of my experience on track is with bikes, but I have several hundred laps around Laguna on probably a dozen different bikes. The only bike I haven't blown sound on was a KLR650 that I brought for putting around town. The weather plays a big part. I have known people with bone stock 600s to blow the sound meter; it's the airbox noise. But a few times I have gone by on my race bike at full tilt and it wouldn't be a problem.
I'm betting the sound meter is the reason that they set up a slalom section between 5 and 6 for the USCA event. Low RPM is low(er) noise. Kinda ingenious in my opinion.
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