Autox and Track enthusiasts are the minority, 6ul seem to be a bit more wheel than the RPF1 with a bit less pop culture behind them, a bit more money for a bit more weight and a bit more strength, if all four of my RPF1's get trashed I'd probably replace them with 6UL's if I can get them in silver paint. Most people are picking wheels based on looks and will happily sacrifice a few lbs to get compliments when hard parked.