The Gen V is just better designed overall. It's almost like a factory ported Gen III, but I think it's still a hair more efficient. The only thing needed to swap a Gen V to a M90 car is a lower intake off an L32, the Gen V itself, and a TB adapter.
M112 is the blower used on Ford Lightnings, Cobras, and Mach1s. No kit exist to bolt it to an L67, but Overkill offers a kit that lets you fit the rotors in the M90 case. Not as efficient as a M112 would be, but it's an improvement over the M90. Not cheap though and not many people running it, so data is hard to come by in real life use.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne