Ummm...A Lunar Rover?
Gran Turismo Lunar Rover LRV-001 '71? (I doubt it )
Good reasoning and very close to the meaning of the clue, but sadly... nope...Toyota 7?
7 is the 4'th prime number and it was a joint development between Toyota motor company and Yamaha motor corporation. It's also missing a consonant (exept the two T's in "toyota"
It's sporty for sure but it's not really a big car...
Mazda Furai Concept' 08