Bike all of the sudden gets really loud

I was at the track today and toward the end my exhaust became very very loud. It is a brand new exhaust system. What could cause that?

As a random guess I'd say the bolts have backed out of the flange..

...is it all still in one piece?

 

I've had the spring holding the muffler onto the header pipe break, when that slid out it made a hell of a racket. 

brand new loose packing blew out

Yeah everything is good and torqued to spec. If its running too rich would that cause that due to increase in humidity

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