Quote:
Originally Posted by E90Fleet
Its actually there to make the exhaust sound less "boomy" at low RPM
It will open at higher RPM.
Its there to make the car quieter`at low RPM
|
Thank you / Dankie.
This makes sense.
Also, on the cold start, I was wrong. I had a look the other day, the butterfly does not open. The exhaust probably just sounds noisier becuase of the higher engine revs at cold idle.
roadsta