I have to agree with @
White & Nerdy and @
Grayfox on the El Niño/La Niña, particularly the pursuit version.
R.I.P. racers.
I have to say though, there's too many good, fictive cars out there, not to say there's a few different definitions of fictive. You could say the GTA cars are fictive, because they don't actually exist, yet they share obvious clues with real cars. Then there's cars like the Mach 5, which shares nothing but the fact it has four wheels with reality (this far..). And then there's real-car-fictive-"tune". Fairlady Z Z-tune anyone?
Anyways, back to the real point of the thread. If I was asked to name my five all-time favorite fictive cars, I'd believe the list to look like this:
El Niño/La Niña from NFS3/4
Ford GT LM Spec II Race Car from GT4-5-6 (it doesn't actually exist outside GT, thus it's fictive)
Mr. Tasty from GTA IV (so much fun trolling cops with Soviet Connection on the loudspeakers
)
Formula Gran Turismo from GT4-5-6. No explanation needed.
And, last but not finally, the best vehicle to make your way up the biggest rock you can find as well as through Star Junction in rush hour, the GTA IV Patriot