The Vroombox is a digital audio player which is designed to make exciting car noises, like an engine revving or tires screeching. Says the official site:
Make your car sound like any car you want.Now you don't even have to bother with the coffee can tailpipe.
Let's face it: you're probably not going to get that souped up hot rod you always wanted. But at least your current car can sound like the muscle car of your dreams.
VroomBox utilizes a powerful microprocessor to digitally recreate the sound of 15 different cars and fantasy vehicles, and play them through speakers under the car. It even includes special effects such as screeching tires and turbo blow-off valves that trigger automatically. And you can download more cars and effects from the web. Sounds and effects are controlled from a small faceplate with a backlit display that fits neatly on or under the dash.