[HotZ28]

You must have a bearing problem in the front or rear housing. If the rotors are rubbing the housing, you will have to replace the S/C. You can check boost with a boost/vac (pressure/vac) gage by installing a "T" in the vacuum line under the snout & front of intake. Not much need of checking it though, if you already have worn rotors & housing! Check Ebay for a replacement. Be careful and look at warranty, number of sales & reputation before buying.