Alright, I have an 08 base model 3.8 GP. I'm trying to supercharge it with a supercharge kit off of the GTP model. Can I just take the supercharger and pulley from a GTP and put it on mine? Or will it even fit correctly? From what I hear, they both have the same engine. Also, I was wondering if OnStar not installed triggers "charging system failure". I have new batteries, new starter, new alternator and still says charging system failure.