Slip on, Cams, Fuel controller, Dyno Tune

I am considering these mods to my 2014. The head is already ported and polished. To what degree I don’t know. I am snorkelled. I get one backfire when I let off the gas every time after the machine is warm.

So with these mods I hope to gain some HP and clear up the backfire.

Are there any pros and cons to this?

What HP gains would I expect to see?