The MXXX designation on the blowers means how many cubic inches of air they move per revolution. Gen V M90 = 90 ci, MP112 I believe the MP is the same and that would mean 112 ci of air per revolution of the blower. I'd suggest having some serious flow as well.

Here's one I put together for a local to give you some ideas of the various pieces/parts. Password is Boosted
Nowie Photos by billboost37 | Photobucket