Got my DB meter in this week.
New SS collector hardware arriving today from
www.McMaster.com
Just waiting on the Welder to have time to come do it.
I need to do some baselines this weekend based on what the OP had experienced at Laguna Seca. Meter is located 50ft from the race line of the track per this video.
https://www.youtube.com/watch?v=lkZYVj89fA0