It took almost 3 months but there are some results:
- BMW Czech Rep. replied and confirmed quieter sound of post july 2019 cars
- BMW Czech Rep. offered us compensation of costs that we invested to M Sport Exhausts
See PDF documents bellow. It is still a sad story because our goal was to have cars with proper backfires and burbles not to save money on sport exhausts. But at least we don’t feel to be ripped off by manufacturer who doesn’t care.