Interesting, but I would only believe anything a manufacturer claims when someone who bought it gave an unbiased opinion.
For what its worth, mine does it with the boost all the way down, and with the cat removed. I still have the damned "jingling" noise on spool point and upward - 15000 miles its been there now on and off, although its more on now than off, and its louder than ever. I have not really seen any thing "definite" posted that this could be as yet, and I know mine is not alone.