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67motorcat, If you still have the checkvalve installed that's what the rattle noise is! It WILL make noise if you tap on the can. It's a free floating steel insert in the outlet fitting that will close and open depending on the vacuum from the system. If you object to the rattling Tracy can send you a output fitting without the valve, which is what I did. As I've stated in earlier posts, my issue right now is the loud hissing noise at idle.
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