Originally Posted by TreDirtyFive
The PPK exhaust sound is a BMW's recalibration of wastegate positioning at certain parts of throttle and idle that give you the gurgling and pops. Almost all the 011 N55s released had this (valve flap open or closed) before BMW snipped all our balls with new firmware that softened tip-in throttle and removed all the gurgling so that it could sell more PK's and make it sound and seem more exclusive to those who purchase. It's basic business as most people who buy these cars, that aren't enthusiasts, won't even realize the difference and will most likely eek out better mileage with the gutted firmware. If you ask me, it's a complete disgrace.
As an enthusiast, mileage isn't a concern, we're all in for the fun and enjoyment of tuning