Sled backfiring with new exhaust

I installed a magnaflow muffler on my 2010 nyrto xtx with a factory header this year and it sounds awesome haven't rode the sled yet because of NO SNOW but seems to run fine.
 
I'm startin to think it might be due to bad gas as well. The throttle cable was adjusted at the dealer last year and I haven't done anything in or around the the cable that would throw the adjustment off. I think I'm goin to try putting some fresh fuel in it and see what happens
 
radianguy dud you run some sort of a silencer/baffle in yours to tone the exhaust down at all? Or just run it straight through?
 
TORS sounds like the problem!!mouse nest in airbox?
 


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