Another Interesting Observation, Exhaust Sound, M235i

Like a previous poster I want to enjoy the pops and crackles with throttle lift off after downshifting and have made an interesting observation.
It's definitely not just the exhaust system. Here goes.........
When in neutral, when the motor is up to operating temperature, if I put the car in sport mode and rev, I get nice pops and crackles. If I put it in comfort mode, the pops and crackles are greatly reduced. I just completed the exhaust valve mod by disconnecting the electrical connection to the exhaust valve actuator when the valve was open. (car off in sport mode, flashlight inspection confirms valve is open). I now get exhaust flowing out of both pipes all the time, it sounds a tiny bit better, but definitely the same as before the mod in regards to the pops and crackles in the two modes. I think the ECU changes the mixture or valve timing or something to make the exhaust sound more aggressive. This is irritating to me as another example of "synthesized" sound like playing it through the stereo. I think the pops and crackles are entirely synthetic. If I put an aftermarket exhaust on the car, will the exhaust sound be consistent between modes? I don't think so. What I want is to be able to drive in comfort mode with a nice exhaust sound without having it be extra loud or even change in sport mode. It seems the pops and crackles are a function of the ECU. Anybody with real world aftermarket (even MPerf) observations on this point?
TIA