The noise is just going to annoy you to death, but otherwise won't hurt anything. It sure will attract a LOT of attention, and probably a few laughs, too. What you can probably do if you don't have any of the original tubes is to cut up some solid 5/16" rod and weld it straight onto to the ends of the plugs. The whole gizmo when screwed in only needs to extend flush with the inside of the exhaust port wall to stop the whistle. If you put a tube (not a solid rod) that is only flush, or cut off the original tubes to be shorter, then it'll just raise the pitch or change the rpm range of the whistle.
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David
newbie #4153
