Bachelors-
You still have time to find a girl that's into cars or at least appreciates your passion. This will save you from the inevitable reality that they may get upset about almost every purchase you make, whether you give them full disclosure about your car addiction before the wedding, justify your purchase, tell them ahead of time about purchases, bribe them or try to hide it. Many wives think they can change you or it's something you'll "outgrow". You'll pay BIG TIME forever if you deceive them because you feel pressured that you have to.
You can ether take a freshly paved highway or a muddy, pothole filled wagon trail from here. Make it easy on yourself and your wife!
This isn't to say you should be irresponsible by putting cars over family. That's never a good idea.
Married guys-
Godspeed!