Originally Posted by marcel b
The exhaust on the 1M does not have a valve (mentioned in an interview)
1) Can we confirm this? I hope not...
2) I wasn't referring to start up. Cold start is always louder When normally driving, if you slowly accelerate from 2000-2500 you will notice a big jump in drone noise especially around 2200. I want more of that deep drone noise to exist under 2200 not just above. There definitively is something keeping it quiet in those low rpms, there has to be, for such a change in sound so quickly.