Dual Exhaust on 2011 335 xi
Hi all, I have a question about my new 2011 335xi.
After the break-in period, I noticed that the right side exhaust is visibly dirtier than the left side one. So I observed how they worked after start.
It seems right after the engine started, both exhausts worked for a couple of sec, then only the right one was working.
Is it normal? Does the left one kick in when driving at higher rev?