Originally Posted by Rick Hohwart

Well for 2007 Tamiya allows them in the F103 GT class for their TCS series and the KO Grand Prix TC (at Tamiya raceway) race allowed them in 2006 and if the race goes off as planned in 2007, they will be legal again.

Legalizing them is not necessary. Most big race organizers and club tracks run their own rules or modified versions of ROAR rules. There is no reason your local track or favorite big race should not allow LiPo in 2007.