09 yz450 exhuast questions

i jst put a Ti4 pro circuit on my 450 and was wondering if i needed to make any mods to it or if i can jst run it stock

i jst took it for a test ride and it was popping and shooting flames on decel. i dont know if its becuase of the cold weather or what any one have any ideas?

ok i was just alittle worried, alot of people on here were tlking about needing new pilots and stuff but thanks!!

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