I have turned 4 (actually 7, but 3 of them where no good) damaged Creative Cambridge soundsystem woofers into woffers in my car.
They came back to the shop because they had their powersuply fried, wich where a weakness on this moddel type. Creative did not want them back, and just shipped out new ones... So I figured... "Hey, I've got heaps of good elements here... Let's use them to something fun"...

I had them in my previous car, a BMW Z3 Roadster, and they played like a charm... And as many cab onwers know... Sound tend to get distoted when you pass about 60km/h, not to mention 80km/h.
That would be something like 37 MPH and 50MPH?

I only use the elements, powered from a car amp. Enclosure is custom, and the reason why I don't have it in my 320DAT... yet...