I have found that you get more pops and gurgles when you let off the gas at around 2k+ rpm or when you downshift just under 2. It only pops more in sport mode because it keeps your rpms higher but I don't think there is a way to code the engine management unless you get a tune. I think you can change what is adjusted in sport mode but that doesn't really help you. So in short, unless you get a tune I don't believe you can change the engine map to get more pops in comfort or eco pro, but I could be wrong.
Adding a down pipe or exhaust will help.
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