I think it should be well written non antagonistic and succinct.
Something like..Hello, the gentleman and wife in the Lotus are member of the finest Hayabusa organization in the world..Hayabusa.org. We gathered in the mountains that very same weekend where our brethren from around the country gather twice a year to enjoy some spirited riding, comradery and good times on the Tail of the Dragon. We passed your friend many, many, many times while he was in town, and now deeply apologize if our exhausts and triple digit speeds upset his careful attempts at maneuvering his Z06 at 15 MPH through the Dragon...it did look gorgeous in our rear view mirrors...we commented on that very much around the campfire...
We hope he wins but we regret to advise that our member Tom AKA jet-Li and his Lotus will prevail in this contest...for the Org is mighty..
We wish you well, sincerest regards
Lycan of Hayabusa.org