First off, I fully understand the need and process for noise abaitment by modification of exhaust there are many other sources produced by our cars.
Tires, intake, turbos, driveline, etc. Even stock daily drivers can produce sound levels above your 96 db target.
I am not saying we should scrap the effort but I believe the level is a bit of a pipe dream.
There are also other methods we have not discussed. Berms, vegitation, panel fencing even billboards can be strategically placed to reduce noise travel in certain directions.
It may not be enough nor the only way we can become "good neighbours".
If this is a true effort we should think about modifications to GMP as well to help reduce sound travel from ALL users.
We should also do distance and direction noise level testing to find out exactly what our issues are and whom they affect. Look at what the direction of the wind has on sound travel.
We are after all operating beside an airport that does not live within these guidlines. Yes, I already hear the people saying but .....
and I agree, an effort, any and all efforts, are signs to the minucipality that we are being proactive.
Natural barriers are signs of long term commitments.