MP3's had the different ECU, a slightly different intake manifold from what i remember, and a Racing beat axle back...FM claimed that the axle back must have been decent, and may have made up the extra 7hp...
The MP3's ecu still has most of the restrictiveness of the stock FS-DE's ECU...ridiculously rich at WOT, and completely all powerful at ridding any mixed signals from EVERY "chip", and most programmable piggy-backs...