Thank you very much for reply.i am wondering how will be to do a dyno test
Once you install aftermarket exhaust the pop on decel becomes more noticable on all bikes. It occurs with stock exhaust too, you just can't hear it. Also, pop on decel is normal because when you let off the throttle you create a lean condition, which is why it pops in the first place. If you're only using a slip on with stock air filter it's likely that you don't need a flash, though you may benefit from one. Start with a Dyno run at Rob's to see how you are running in the first place.
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