It will most definitly not help you if you haven't got any game. I drive a '96 BMW M3 convertible
(same car, red seats) and it only worked in a positive way on a very limited number of girls that already liked me.
I have had a girl mentioning to me that I drive quite a big car when I was driving my father's '09 Supercharged RR but she also already liked me before she knew what cars I drive.
On the other hand: if you want to increase your number of male friends it does help. Because they all want to ride along with a sports car. But that also goes for a RR.
AND:
It does work on women of older age. Say the milf and older group. As they know the value of money and know the necessity of money in order to have want they want. (Usually they're divorced or shit, got children and all they want is a wealthy lifestyle with expensive clothes and so on.) Most older women I know, know damn well who I am and what cars I drive.
But the most important: I don't drive a sports car to impress girls. That's not my goal. I drive it because it's fucking fun. It gives me an adrenaline rush when I go full throttle and the sound of the exhaust gives me a hardon. (that last part is a joke.)