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I got a basic rebuild for $500 off an Ebay store. You can get rotors coated and port work to get more out of the blower for more money at other places. I went with Marden 4063 or The Supercharger Store. It got new seals, bearings, a magnetic fill plug and came with 3 year transferable warranty. I am sure the old blower is getting sloppy enough to lower boost and increase load. Damn thing started rattling at idle.What'd it run you, what was done, and where'd it go?
SVT