Hello Karl
This forum has launched me on a steep learning curve.
By going thru all the posts I already figured out that Raymond was the guy you mentioned.
And I've just about read all there was on the resonance flap ,and have performed and passed the grease blop test with flying colours
So my Flap is working, but I'll still replace all the vacum tubes on the next overhaul.
I also got the new URL for mmm-five's dyno test, and his curves resemble those of my rolling road test. The Torque dip is almost identical but I believe my BHP dip was a bit bigger.
However since that test I have driven the car for more than 5000km with lots of long Autobahn runs and some nice blasts on the connecting countryroads. It might be wishfull thinking but it seems that the car is loosening up a bit.
My mechanic is almost sure that a partially blocked catalyc converter is cuasing the problems.
He's had quit a few M cars including a M5T and mine seems to be awfully quit!
with kind regards
Tamar
p.s I tried to send you a PM but it bounced stating that your inbox was full. Tries also to e-mail you, but that bounced as well