Seen something like this before in Australia. They were flying off the shelves over there. That version was an accessory socket plug-in device.
Interestingly, Lotus were pioneering this back in the late 80's. It was known as 'active noise' and had two elements. One was an inverse sine wave that effectively cancelled out the engine (true sine wave) noise, thereby making the car sound much quieter. This worked well in tests and I'm surprised it never saw production. The second was as per your device and much like the new M5 in that the stereo played a faux exhaust tone so you could make any car sound like a CanAm racer (or whatever) from inside.
Looking at your videos, your speedo seems to be working in slow motion. Si. <This is my name.
I eat rat poison.
A man ain't truly been insulted until he stands buck naked in front of a woman and she didn't even notice. Or care.
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