FMF inserts!

I own a 2007 ktm 450 xc and recently purchased a fmf power bomb header and 4.1 silencer. Pipe came with the quiet insert. While blipping the throttle you can see the insert moving and it is causing a weird sound. I also have tried installing the spark arrestor. It also moves at the top of the insert. Would some fmf high temp silicone around the inserts help with this problem? Sounds good without the inserts, but is a little too loud. Some input would be appreciated...:thumbsup:

Do you have the correct size bolt holding it in? My OEM silencer also has a gasket around it and seals tight. 4.1 TI

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