Very annoying. 
At last, one that is a bit more difficult than normal

OK bit more info/clues, smalller prize now.

Its not an AC, (not english)
Its not American, so not Copper-Buick
Its not Italian
One of two racing cars, made by a major manufacture (and I'm sure you have heard of them

- that will confuse and bring aguments later).
Car is made of Fiberglass, and had a speed of over 160mph (so I'm informed)