NO, running the mp2 lower with the modsbm higher is what most would reccomend for you to do. The mods are for the analog input stage, so by running analog out of the mp-2 into the analog in of the modsbm, the analog stage is effected and improved. Running a pre in front of an a/d is a very common practice, as both will effect the sound that you are hearing. The stock sbm-1 is crap BTW, and I would most certainly reccomend the mods being done if you have one. That said, this combo was quite common until the v3/mme appeared, and you should be able to find bunches of samples with this lineage on archive or other download portals. My opinion...a darker tape will be made that should be fairly pleasing to the ears. What mics BTW?
Daryan