Ahmet
I did something similar to my 735i....it looks as if it has the exact same AFM! All i did though was back the spring tension off by about 3-5 notches....from my understanding -- the AFM really controls idle more than WOT....the one thing i did notice was the "needle" had wore a groove in the resister panel, right around where the needle would be at idle -- or just off idle(on throttle)....interesting....i think a new AFM would do wonders on either car. You have to factor in 15 years or so of driving on that seemingly delicate piece...just some thoughts...
------------------
|