This is gaining more and more traction on the Toyota 4Runner forums, thought i'd see what you guys think.
The more and more I think about this the more I think that it would be possible to run a dual-charged system, 1 supercharger 1 turbo. Think about it, the TRD supercharger puts out roughly 7psi with the stock 2.37" pulley, go to the 2.2" pulley, and that's another 1.5-2psi. Go down again to the 2.1" pulley and you gain another 1-1.5psi over the 2.2" pulley. That's now a max potential of 10.5 psi. The URD 7th injector CAN support that amount of boost.
Running the supercharger on the stock pulley (7psi) and running the turbo kit on low boost (2-3psi) should be enough for the 7th injector kit to support both the turbo and supercharger since the 7th injector adds fuel when you boost more, it should be a linear ratio of boost to fuel.
Add a methanol injection in the mix and i'd say you'd be safe to run a twin-charged setup!
But like most of you, i'd swap out that turbo for something a little better.
Please add your input as i'd like to see what others think.