Saleen new inlet/intake for Series II

I think you might be out of luck on the rotor swap idea. There's more to the TVS units than just different rotors. The case is most certainly altered to increase its rigidity, the inlet/outlet design will be have changed somewhat as well, to accommodate the needed alterations in case timing work with the 4-lobe rotor design.

As far as basketry goes.....I suppose anything is possible and making some type of adaptor plate to bolt the M112 to the stock Saleen lower manifold is doable, but keep in mind your current Saleen kit utilizes a standard nose drive length that allows the M90 to work with the stock accessory system. The TT kit utilizes a longer nose drive in order to work with a secondary "piggy back" style blower drive system. The problem you run into there is the inability to make the required amount airflow with the limitations of the stock crankshaft balancer pulley diameter. The 4.6L timing cover tends to get in the way when you use a lower pulley much larger than 7.25” (which will have to be made custom and is quite expensive). This is again why the Cobra and Lightning’s utilizes a secondary pulley and drive system....to provide the addition of a larger crank pulley combination that will increase blower speed to desired levels. Without it, you'll probably be limited to about 8psi with the stock crank balancer, which really won't put you any further ahead than you were before with the M90.

To top it off, you're still working with the far more restrictive Saleen lower intake. You can throw as much air as you'd like at it, but if you're still not doing anything to free airflow up below the blower itself and get it into the heads you'll find it’s a lot like trying to ice skate uphill. The end result will probably show a few more PSI on your boost gauge, but all that really mean is that you're backing the majority up within the intake manifold itself and as a result probably only creating excess heat as the byproduct. Somewhat counterproductive if you ask me?

If you're trying to cut costs, your best bet would be to pony up the cash for the "supercharger-less kit" that TT sells and pick yourself up a used M112 on Ebay that someone had on their Cobra. At least that way you know you're actually able to move the kind of airflow you want out of an M112 and that it’s actually doing something more than stacking up within the manifold. Just keep in mind, this isn’t the same Magnum Powers 112 unit that Tork Tech utilizes on their complete kit and the end results will show as much.