I was told by Paul from xfactory and Jason S. that the Carbon chassis would help most in a stock class, because of the weight reduction. However when I actually weighed the two to see the difference it wasn't a lot, but I guess every thing helps. Paul told me it would also help in a mod class if I made it stiffer, where Jason told me it would flex to much for a mod class. So hard to say as one does reviews and seems to know a lot, and one is a xfactory engineer who is trying to sell a product.