From and Amazon review:
Did not work for me, January 3, 2010
By Maurizio Laudisa
I was kind of excited about this silly little gadget, considering I was looking to use it for a bit of fun on my month-old Mercedes E350 Coupe', not a low end beater! I had had a similar idea about 6-7 years ago, and I was thrilled and bemused to see someone actual carry out something like this, I thought it was a cool little gadget.
When the package arrived today, I immediately read the instructions on how to sync the device to the car's FM radio, and the engine revolutions. The instructions are simple and easy to follow enough, no complaints there. The device easily synced with my FM stereo, and the idling was fine. It also seemed to sync-up when I revved up the engine, per instructions. However, as soon as I started pressing the accelerator again, the device starting revving up and never followed the engine up or down, getting "stuck" on the same engine level at around 3,000 rpm. I repeated the procedure a couple of times, same results. I then tried it on my other car, a Toyota Echo: same results exactly. I had ordered two of these (the V-8 and the V-10), and they both behaved in the same way. On top of that, frankly the sound itself is pretty fake and "electronic", it does not have the depth and tonality of a real engine.. it's sounds tinny and "synthetic", which of course it is.
So all in all, even though I'm still amused at the ingenuity of the inventors, I am disappointed that neither of these worked for me, and will be returning both units.
Looks like I'll be saving the 40 bucks plus tax and shipping. :sad: