Can my supercharger be low on oil, i am hearing a bearing whirring noise? if my supercharger is no longer any good and i want to bypass it will this have any ill effects on my engine. thank you!

Well, lets see....there is no "Grand Prix Turbo" so I am assuming that you mean that your Grand Prix is a 3.8L that is equipped with a supercharger.

The supercharger bearings are lubricated with synthetic oil that is contained in the supercharger gousing. It is self-contained and does not rely on engine oil for lubrication. You can check the oil level in the supercharger by removing the plug in the supercharger housing (see diagram)

CHECK TO MAKE SURE BYPASS VALVE GETTING VACCUM TO CLOSE TO INCREASE BOOST TO ROUTE MORE AIR TO INTAKE MANIFOLD.IF BYPASS VALVE IS GETTING VACUUM AND CLOSING.PROBLEM COULD BE CLOGGED FUEL FILTER OR PLUGGED EXHAUST SYSTEM.IF SUPERCHARGER ITSELF WAS BAD YOU WOULD HEAR NOISES FROM WORN ROTOR BLADES HITTING OR ROTOR BEARING NOISES.

a whirring sound can be a bearing on a component under the hood.(power steering pump,alternator,idler pulley bearing,etc),it can also be a serpentine belt from a worn belt or belt tensioner a cv joint won`t make a whirring sound(it will cause a clunking noise or a vibration).

You can bypass, but you would rather want to replace the supercharger.

The chattering sounds like some thing loose,like a mounting bracket. or the shafts end play is excessive,there can be bearing failure at high mileage in the supercharger, The bearings are lubed by the engine oil while running check for oil leaks in the line to the supercharger.

the high pitch noise leads me to believe a problem with the hyudraulic clutch. Have you checked the level? also with manuals you dont have tranny fluid, you have gear oil; which is very unlikely that needs changing

The rattle you are/were hearing is typical on the Eaton blowers. After they get some miles on them, the coupler wears out and the holes become ob-longed or out of round which causes the rattle you are hearing.
Usually at idle you can hear it very clearly.
I have changed a few, and they are pretty simple to change. Just take off the supercharger belt, then you may have to remove your alternator bracket, depends on which years, drain the supercharger oil with a spray bottle sprayer (it does stink badly) then just remove the 10 or so bolts that hold the snout to the housing. Remember to keep track of where they go, some are different lengths.
You may have to use a rubber mallet, or your hand to hit the snout around to break the gaskets loose. Pull off the old black hockey puck looking thing (coupler) clean out the snout, attach new coupler, then reassemble and put new supercharger oil back in, and your rattle will be gone, at least for another 100k miles.
Best place to get a coupler is at,
http://www.zzperformance.com/grand_prix/products1.php?id=155&catid=106
Costs about 30, plus the few bottles of oil for the supercharger.

Sounds like a wheel bearing. Get another diagnosis from a good shop or two..

replace oil filter bypass (the boss that the oil filter screws to)... other than that ..oil pump failing...main bearings out of spec not allowing oil to stay under pressure and reach the upper valve train...good luck

On the let front of the Supercharger there is a small level plug that is eay to remove, Whatever you do,,,do not overfill. The oil is only available through the dealer at about seven dollars for a couple of ounces. Takes about ten minutes. Good luck