Exhaust backfire

My exhaust back fires when shifting at a specific rpm at times, but not near hard enough to throw flames. I am also still tuning, and my car is fully open piped containing no cats
 
Yeah my Tsudo used to throw alittle flame SOMETIMES. but it would pop everytime i would redline 2nd and shift.
My stock exhaust never throws flames but it pops sometimes. I can never replicate it, it happens very randomly.
 
So I've got a Flashpro and a few bolt ons (Takeda cai, skunk2 "header", skunk2 exhaust).

I'm not very well read when jut comes to tuning. I would like my car to make decent power for what work is done to it. But I would really like to get a nice 2-step and backfire.

I have a feeling if I change the fuel ratio and maybe the timing a little and change the rev limiter to 4k rpm that might do it.

Any advice?
 
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