I'm not dead set on the twin or a single yet. My Mopar which is rear mounted with a single 76mm Turbonetics on a 408 is plenty of boost... If I fab a single and mount it just outside of the engine compartment then I've got to build a hot side cross over pipe. Twins obviously require even more fabrication and would require merging the cold side near the Engine compartment too. Twins=more money, more fabrication, more cool factor, more torque, higher boost availability however I'll have to replace the pistons for forged slugs... Single=less fabrication, less torque, less cost, less weight... I'm not pinching pennies necessarily here, but as a fabricator and Engineer nerd, I always prefer to build my own stuff... Now the tune, I'll be seeking expert advise! I can tune an old fashion carb'd hot rod motor all day long but the Coyote PCM is outside my tuning expertise...