powercore 4 silent insert

I've read all of the threads on the silent insert for the powercore 4. I have a 2000 WR400 with a FMF powercore 4. I had a sound test done and failed with a 99db. I bought the silent insert but it doesn't fit the pipe I have. Are there different Powercore 4 mufflers? On the FMF website they say that there is a silent insert but none are shown. I am racing next weekend and I need one quick. Any suggestions?

For now, I put on the original pipe which is a YZ426 pipe with a Pro Moto Billet insert. Will this pipe pass the sound test? Any help would be appreciated.


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