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back firing

Engine

Model: 911 carerra, Year:1986, Mileage:100k, Type of use:Street use only
I have a 1986 911 carrera with 100k on it. I have slight backfiring on deceleraion. I recently put on a fabspeed exhaust and cat bypass. I have a steve wong chip, replaced all plugs, wires, rotor,and cap. I cleaned out the Air flow meter. And still have slight backfiring. Is there anything I can do or will I have to live with it because of the cat bypass and sport exhaust.Thanks

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