First of all, Saleen superchargers aren't known for being the quietest ones out there. They are known for some bearing noise. Your best bet is to take off the belt and turn all the pullies by hand. Could be an idler, tensioner and so on. Also, you will need to reflash the PCM for both cars. You cannot just swap computers. The 05 will have to go back to stock and the 06 will need the s/c tune. Also, try to find out what kit is on the car. Is it a 435,475,550 ? You will need to know this to properly tune the vehicle.
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