got the 400r handset installed on my RS and wow what a difference from the fpm375 i was running before car seems smother and a **** of a lot faster and the turbo flutter and pops and bangs seem to be enhanced
I was surprised how much the behavior of the machine changed, the exhaust sounds maybe a little quieter than with the M380 and I think now the exhaust valve works properly i.e. in standard mode the valve is closed and the car is really quiet but still the power is on and when changing the Sport, Race or Drift model opens the accelerator pedal response sensitized, I am very satisfied!
Upgrade Key was sent via email in a few Days and the installation was easy. The change it did is fantastic, the car makes even more fun now!