superchargers run off of a belt that is driven by the engine's crank, parasitic. Now I personally would not bother with this especially since building your own 'turbo-kit' can be much simpler & easier. Then again I am biased bc I have done this a few times now with other engines, at this point I do not want to mess with the red-top (though I have all the materials for the turbo manifold ready & a smallish turbo). From my experience I can garantee you the 50 extra HP will great and all but you will be craving a WHOLE lot more pretty soon after. It is called BHS, an honest to god affliction. Boost-Happy-Syndrome will cause you to go mad & throttle heavy very VERY often.
I am pretty sure you will want more. Now you can possibly do this boosting safely up to 8psi with the stock parts (or so the rumor goes), my previous 5SFE I boosted all the way up to 14/15psi during spikes and it held up perfectly. I would personally get a Cometic head gasket made just for safety and allow a slight drop in compression, this would however seem to be a sad thing to do to the red-top tho. A FPR in the form of a Vortec FPR,
Vortech Engineering: Viewing product: Fuel Management Unit or close to that, rising rate 12:1 *AND* with this little unit you can keep your current injectors, should be safe-ish on your suggested 6psi. Of course an adjustable FPR would be nice too, but this vortec one is simple & easy. As for the blow off valve, I would go for an R2D2 from SARD, low profile & slick. Upgrade to a Walbro fuel pump. Safety.
This going into an MR2 isn't it? Might be a bit more of a pain to build your own turbo manifold for an MR2, since its sorta put back there in the back of the car and not as easily reached like it can be in a Celica....
I have an intercooler placed on my ST184 already, my version of cold-air-intake and it makes a pretty big torque difference. I will need to hit the Dyno for figures still. I installed it pretty much to have this part of my baby-steps RedTopTurbo build out of the way already. It is a huge-ish EVO8 sized intercooler, see attached. It's 3.5 inches thick, all piping in & out of the IC is 2.5 / 2.75", as well as to the MAF is 2.5 / 2.75"
Side-note, I busted my Koyo radiator, put a nice hole in the lower part of the core
Gonna find me an adequate alu-welder who can fix that for me & invest in some of that chicken-fence screen crap to prevent pebbles & rocks from hitting it again....