[Serybmw]

Greets from Moscow!

Could you please help me to resolve the issue with the exhaust flap in the left pipe? As far as i understand while installing M Performance exhaust you should remove the flap valve from the standard exhaust and install it into the Performance one, right?

What if not to install it back and instead leave a cover which presumably comes with Performance exhaust, on its place? Will there a be an error sign?

And one more thing. The dealer does not recommend to remove the flap as "it influences the gasoline fillability of the cylinders on low revs and therefore the power will be decreased if the flap is removed". Does it sound reasonable? What do you think?

Thanks!