Question on fmf powercore VI

I just bought fmf powercore VI used need some help on install,first thing I notice about pipe is that mid section seems smaller in diameter than stock? and I can't use stock gasket is too big, Is it possible that I bought a fmf powercore for A yz250F?

What year bike are you putting it on? Most aftermarket pipes don't use a gasket at the midpipe joint, most just slip over the header. You can use some high temp silicone to make the seal better if you want.

OK, Its a tight fit but its on although stock clamp is to big, and thanks for suggestion on high temp silicone.

You don't use a clamp with a slip fit pipe, just slip it on.

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