So how about as a reputable company you get a reputable shop to dyno the car with the exhaust. Why is that so difficult? Are there no reputable shops? Are you not a reputable company? I'm well aware of the different parameters that exist which MIGHT make dynos results completely worthless but thats why I mentioned having someone reputable.
"Eisenmann exhausts are engineered and manufactured (Hand-crafted) in Stuttgart, Germany for maximum performance and deep, super sporty sound, using 100 % ultra light weight stainless steel construction."
This is what you state, how can you say "maximum performance" when you are unable AND/OR unwilling to even quantify it?