You do realize you just completely agreed with my reasoning, correct? LS1 in a Mustang versus 4.6L DOHC in a Mustang versus LS1 in a Camaro: Better looking. Nicer interior. Nearly 200lbs. lighter than factory. Off the front axle. I can't tell you how important this is to a road race car. Smaller motor means more in-car service, easier to service/diagnose at the track/during a race. T56. More usable powerband for road-race application. Makes more power without F/I, a big road-race headache. Easily takes to aftermarket modifications. Better technology, while being simpler, more reliable. Direct bolt in swap. Huge parts aftermarket and tuning base. Cheaper than upgrading to built Mach1 4.6L DOHC, T56. And, as is most important to me. FASTER. Much, much, faster.