So far, all NASCAR has said is that there will be some changes in the engine rules..... My guess is going to be they'll step the performance on the Cup Cars back to near the levels of the Nationwide cars, that takes about 5 mph off them on the 1 1/2 mile tracks... Compression cut down, less on the heads. With the EFI on the CUP cars now, should be a fairly easy deal without a lot of expense!!