Pops and bangs, unless like already said is a state of tune. Unfortunately not very desirable, especially in a carburated car. The tune that is. What you are trying to create is a over rich unburnt fuel mixture in your exhaust, which needs a way to ignite it and/ or oxygen to support it. Having a catalytic converter will take most of that opportunity away from you as it is designed to superheat the exhaust and burn off exactly what you need for your pops and bangs. it happens a lot on race cars for that exact reason. Race cars run rich under closed throttle situations due to the rapid closing ot the throttle plates. There is a fair amount of unburnt fuel left from the last full throttle acceleration. When reopening the throttle a rush of new oxygen and superheated exhaust gas enters the open exhaust causing an ignition inside of the tail pipe. This is kind of a simplified description of what happens but hopefully it helps.
On your street car if that is what you want I would remove the catalytic converter. jet the carb to the rich side. and create a small exhaust leak near the manifold. IT would create the conditions you are looking for. And dont feel bad. My son wants the exact same thing for his 2017 abarth spider and is planning to spend a lot of money for a pops and bangs tune.