The sound limit at Laguna Seca raceway is 92dB. This is incredibly quiet for a race car. The sound check booth is on the right side of the track on the exit of turn 5. Many folks do something simple to their exhaust like this: A piece of metal macaroni that redirects the sound away from the booth. This is my Lotus tailpipe the night before my track day.
UPDATE: The macaroni worked well while it was attached. When it came loose, which happened 3 times, the car was over the sound limit. The net result is that my day ended early with 3 strikes for sound violations. Boo hoo. I need to get something that bolts on.
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