I am trying to find out the horsepower difference between the Eaton M90 and the M112...To see if the M112 is worth the upgrade...

 

HP diff is all dependent on mods. first what setup/ mods do you have?

the only real reason to swap to a m112 is if your are pushing past the efficency of the M90... and for that you would be runing something like a 2.8" pulley or smaller, full size intercooler, 50-60lb injectors, 102 plugs, headers 3.5" dp, 3" exhaust-no cat-HF muffler, custom tune via tuner, cam, springs, timing chain, possibly even ported heads!

i doubt you have all that. normally it you need an M112 you will know it. there is also the wipple charger... another option when you are considering a diff blower. but again, you have to have some very extensive mods before you even need a diff blower.