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ok then count that one out. Idk man maybe its the gas ur running. With as much stuff as you have done to ur car id take it to a tech and have it checked out asap
what octane are you running? Someone mentioned timing, it's starting to sound like that to me. Wrong octane fuel with the timing being moded would cause backfiring especially at WOT or heavy acceleration.
ok then count that one out. Idk man maybe its the gas ur running. With as much stuff as you have done to ur car id take it to a tech and have it checked out asap