its 4.0 stock. pretty good alternative to FI imo. comes with a 4 year warranty. Dinan builds the engines for the ALMS series, so hopefully they know what they're doing. I know they are very conservative sometimes and obviously overprised, but for $6k I think a new engine is worth it.
Were thinking about a modded E92 M3 with dct for my dad now. Even with a dinan engine, brakes, cf, wheels, nicest suspention I can figure out... it'll all be cheaper than a new M5.