I personally think the 4th GEN MP112 in the Roush is being harshly criticized, but if you guys really have the urge to jump up to the new TVS style blower, you could always contact
http://www.harrop.com.au/index.html and have just the supercharger unit itself sent to you and build up some form of adapter plate and custom inlet to work with the Roush manifold.
Truth be told, the Modern Roots Hybrid blower's are nearly as efficient as their Twin Screw couterparts and actually even more so in the lower ranges since they aren't compressing the air under vaccum. You've also got to consider from a performance perspective.....we're comparing the capabilities of a 112ci blower (the MP112) to a 140ci blower (the typical FRPP/Whipple Twin Screw). Were the two blowers more equally matched displacement wise, I'm betting the Twin Screw advantabe wouldn't be nearly as impressive.
Hell, if you want to stray a little from the stock OEM blower, the Magnuson based MP112 will actually outperform (by a handy margin) similar and even larger displacement Twin Screws.
These modern Hybrid Roots chargers aren’t like the old strait cut lobe design Roots units we all remember sticking out of the hood of our favorite muscle build ups during the 70’s and 80’s, or even the hybrid 1st through 3rd GEN 3-lobe 60-degree profile Eaton’s uses in cars like the Supercoupe Thunderbird.