Silencing a squeaky exhaust

OK, I figured out the exhaust squeak on my F430 isn't from the bypass valves, but rather from the bracket that joins the two tailpipes together for stability. The bolts holding the bracket are extremely tight, but they still squeak when you 'hand shake' the outer tail pipe. Of course, it is much, much worse when the engine is actually running!

Taking these bolts off would be quite a job, and one that I wouldn't want to tackle, since this would mean removing various panels and such.

Can I simply apply a high-temperature grease (something good to 2500F) to the bolts? Think this might solve the problem simply and quickly? I can reach these fairly easily reaching down through the engine compartment, so I'm hoping somebody else thinks this might be a good thing to try.

Thanks for any advice!

 

My VIN ends at 145157, so I wonder if this technical campaign #163 might still apply? It's a 2006, but maybe they still don't have it right?

So this is a regular service problem? That doesn't make me feel real good at this point.

 

After using a small mirror and a flashlight, indeed the exhaust bracket IS broken; snapped in half right at the bolt.

Obviously, this seems like a weak part. Does Campaign 163 for this use a re-designed component?

Thanks again for everything.