The 5.0 twin turbo could be and I'm not saying it is but it could be the next shelby and will probably be in very limited numbers due to the CAFE coming up. Everyone knows the 5.4's and the 5.8's will be gone. So more than likely be replaced with the 5.0 for SVT cars and the gt model will probably run with the 3.7 v6 in an tuned up ecoboost. As it is the v6 when supercharged will give you bout 450-475 and still have great fuel economy. JMHO