Time to get my tub of electronic componants out ... and make an "electronic dump valve noise generator".
I could set it up to work whenever i use more than half throttle ... simply have one switch on the throttle unit for "charge" and another on the clutch for "discharge" (or make da noise). Pink or white noise, speaker behind the front grill or under the car???
Its such a good idea ..... you could operate it whilst sitting in the carpark with no engine running!!!