For drag racing you want the "snail" type or centrifical supercharger. For low end torque & wheels spinning street fun get a screw type like a Whipple.
ATI Procharger probably has the best rep out of the centries (they look the best also IMHO).
Get it to a good garage quick. Dont mess around w/ changing fluids except if it needs a flush. Sounds like its on its way out. That way my van trans started before it needed rebuild.
Good luck
Shop that messed up my paint has told ins co to void the check. They have re-issed check in my name & car will be painted correctly this time. Thanks BIGREDBEAST!!!!!! You helped immensly & your shop is gettign the job!!!!