Not sure if it helps but BST made some 18" carbon fiber wheels that will fit.
There are also a few maps floating around with a 9000 rpm limit which will get you much higher than the stock rpm. I've heard rumors of a 10,000 map too, but never actually saw one.
If you had a few extra $$$ to spend [USER=3591]@R-III-R Turbo[/USER] has developed a way to add a 6th gear, which will give you access to a few more mph.
