Does anyone have any feedback on BMC, ITG or K&N air filters? I am not too worried about the MAF issues. It seems the problems occur when they are re-oiled. I have K&N's on my E39 M5 and had no problems (knock on wood). I think they give a higher pitched howl when stabbing the throttle on my M5. I was wondering if anyone noticed any differences when aftermarket filters are applied to an RS6.
Tom