I've had my 02 M5 for about two weeks now and got a SES light the other day. I took it into the dealer and they say it needed a new breather valve which they have ordered and are repairing under warranty. My question is does the faulty breather value affect performance in any way? I did a search here and one thread claims to not change performance, but my service tech said that the breather valve would definitely change performance. I thought it was fast before, but would be very happy if it comes back even faster. :1: