I have been using a BMC air filter on my 550 for about half a year now. Not only does the car sound better, there was definitely some bhp increase so it was definitely a "happy" mod for me. However, I have now heard of two 911s (a 993 and a 996 Turbo) running on BMC filters which have had damaged airflow sensors. Both owners have been told that the damage was probably (not conclusive) due to the use of oil-based filters which resulted in more oil + dirt getting stuck on the airflow sensors. Has anyone faced such problems on their Ferraris, and in particular on a 550 ? Is there a solution to this "problem" ?