Motorcycle Exhaust Pops & Explodes

I just got a new motorcycle exhaust not to long ago, its only a slip-on.
Sometimes when i start my motorcycle the exhaust will make a loud “bang” noise or it will shoot “fire” out the exhaust or both.

My motorcycle shop installed this exhaust tip and said it was good to go. Im wondering if this is normal or should i take some kind of action?

Does it hurt my motorcycle in anyway? and what causes this?

It did not do this with the stock exhaust.


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