Exhust proublem

Ok has anyone ran into this kinda new to quads. I have a fmf full exhust and where the header and the exhust clamps together by the seat keeps comeing lose. It's like the pipe egg it's self out. Any ideas how to fix. Nasty virbration after a couple hours of rideing. Is there something so I can make it fit alittle tighter. Can I expand the header alittle. Not a clue

I used a standard exhaust clamp on mine.... holds well... i snapped the band clamp due to rust and age... but maybe some heavy duty thread lock on the threads? or maybe a new clamp altogether would help...