Don't have horse in this race other than being on the sharp ends of many requests on how to reduce noise without reducing power. BUT it would seem to me that MSNZ as 'your' representatives/agents to local bodies & the RMA etc need to go back and renegotiate this whole subject, its too much of a moving target to not allow compensation when climate & immediate terrain/structures can affect the readings taken. One thing that has always annoyed me in relation to rules etc surrounding motorsport is that when it is realised that a rule cannot be sensibly obeyed or enforced that neither party seems to have the sense to remove the offending rule and start again. Adding extra sections- addendums etc usually just compounds the original problem creating a nightmare for all concerned.