Exhaust sound and BMW M3 E46 issues

I’ve noticed that changing your exhaust on the E36 and E46 M3’s dont change the sound at all. I miss the raspy barks the cars gave off in F5. I’m not sure if all cars or like this or just these’ I haven’t played around with it yet on other cars. If all cars are like this and there aren’t other sound files for upgraded exhausts can someone please clarify.

Also the redline on the HUD of the E46 M3 doesn’t match the one the car really has.

Thanks T10 if you see this