Someone needs to come up with a device with various engine sound wav files that can follow the engine and throttle on your otherwise quiet motorcycle. You could plug it into the stereo like a flash player but also with a sensor to detect rpm to speed up or modulate the wav file. Wouldn't it be funny to pull up next to some loud pipes guys and rev your quiet F6B like a top fueler. Of course you would need to add a lot of horsepower to the sound system.