Originally Posted by TBatt

Don't be alarmed at the rattling sound of the SC. It is normal for it to sound like it has marbles in it. Really! The gear drive has backlash by design and when the engine idles the SC has no load on it and the engine does not run at a perfect constant rpm so you get a rattling sound. As soon as the SC accelerates or has a load on it the gear backlash is taken up and all you should hear is the beautiful whine of the SC intake.