SoundRacer

This is one wild car accessory! Just plug it into your car's 12 volt socket (that's the cigarette lighter socket), select a frequency for the car stereo receiver and the SoundRacer mimics the sound of a racecar using your car's stereo! It's incredible! (Please note, this product does not work in a hybrid or electric car)
The SoundRacer senses and calculates your car engine RPMs and matches it with just the right engine sound effects. Whether you're accelerating, decelerating, shifting gear, cruising the highway or idling – you'll think you're driving a genuine supercar!
SoundRacer works on most models of car in the world – including automatics. Whether you know someone who's just got their first car or your grandmother thinks she's Mario Andretti – it makes a great gift for drivers of all ages. (Even better if you can plug it in without them seeing you, the look on their face will be priceless.)

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The SoundRacer will also work as a standard Car FM transmitter for MP3 players, featuring a line in socket for playing music on your car stereo (3.5mm stereo cable included).
Give your car the grunt you've always dreamed of - with the V8, V10, V10J, V12 and now...Multi-Engine (X) SoundRacers...and always remember, it's what's on the inside that counts.
The new SoundRacer X (Multi-Engine) includes sounds recorded from four amazing cars and two great motorbikes. It has all the sounds of the original V8, V10, V10J and V12 (Shelby Mustang V8, Lamborghini V10, Lexus LFA V10 and Ferrari V12), plus an additional two new motorcycle sounds (Harley-Davidson V-Twin and Suzuki GSX) all in the one SoundRacer. What's more, new sounds (up to 500 in total) can be added via the included 1GB MicroSD card. Let your imagination run wild and make your car sound like a steam train, starship, turbine and more! Just check-out the new video demo below, which also shows the SoundRacer X's ability to charge devices via USB, such as your phone or tablet.