I'm brand new to the club with about a thousand questions. By way of explanation I have wanted a BMW since I was young and saw one at a SCCA event in Maryland. Both my parents amature racers and would drag me to the competitions. This was my dream for 40 years. My dream was fulfilled August 10th of 2007; I picked up "Beauty" a brand new ÃƒÆ’Ã†â€™Ãƒâ€šÃ‚Â¢ÃƒÆ’Ã‚Â¢ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡Ãƒâ€šÃ‚Â¬ÃƒÆ’Ã¢â‚¬Â¹Ãƒâ€¦Ã¢â‚¬Å“07 Z4 M Roadster. She is even more fun now than when I first got her. It is a shame that Florida does not have the roads to really let her shine. 3 questions: 1. I'm running Nitrogen in my tires and swear I am getting better performance than when I ran air. They seem to stick better and I don't feel tire roll in tight turns. Have others found the same thing? 2. This question is about bimmer etiquette; I wave at each ZM or Z I see but seldom get acknowledgement. Is it impolite for me to let them know I'm thrilled to be part of their special community? 3. I have a Xylon coating on Beauty. I'm using the Mr. Clean Auto wash system on her but if it even looks like rain she gets water spots. Any suggestions? Now about nine-hundred ninety-seven more to go. Thanks.