We'll also see how the 4B11 will handle high boost applications. I think mitsu did this for another reason. It is lighter and better at stock levels, but what about when mitsu denies all the warranty claims for blown engines that buckle under high stress. The iron block 4G63 seems to be the main thing on the Evo that you never have to worry about. Just another excuse to deny coverage. The 4G63 is practically bulletproof. I doubt that the new engine will be as good as its predecessor.