Turbo chatter, turbo flutter, 'wastegate chatter', dose, off-throttle compressor surge, choochoos, pigeon noise, whatever you want to call it, it's an iconic sound of tuned turbo engines, I love it, and still one a LOT of people don't understand. Lots of people still think it's caused by a certain type of BOV, lots of people still think it's from a wastegate (where did the 'wastegate chatter' thing come from btw? I first remember hearing it on Top Gear from people like Tiff Needell etc back in t