I don't think so, it's a good idea though. a while ago I did some hunting on this with regards to lowboys and came up with a few random threads here and there but nothing conclusive.
The problem is things vary depending on weather conditions, the testers position, track requirements etc. Ignore any phone db tester results, they are hilariously inaccurate.
My Comp Werkes low boy is super loud, but eventually I've come up with a home made baffle solution that gets me down to ~99db if required for track use, but it def feels restricted. With the supplied baffle it's over 105db, I haven't bothered trying without a baffle.