Having problems with acceleration. When taking off, the car gets up to about 4500 rpm and then doesn't seem to pull any more. Could it be my plugs? The car runs fine besides that. Also bought a reconditioned rear turbo from Majestic Turbochargers in Waco Texas ($600.00). After having it installed I notice a strange smell like nail polish remover coming into the car when turbo kicks in. The sound of the new turbo also sounds more like a thrushhh rather than a whine like it did before I changed it. Mechanic who changed turbo didn't remove intake and took a long time to do. Did this to save on gaskets. Would it have been better to remove intake?