the weights for u2L SS seperate series is the same as the CAMS SS rules - ie: 780kg inc driver for 1601-2000. At the moment 12a is only 20kg heavier, but so is the 13b.
I don't see many building up a 12a trying to beat the 2L cars as it would be less power. But including the 12a into u2L may let some of the older cars with 12a's race other similarly powered cars.
