My ways of defining a cool car:
Pros:
1. Is it outrageous?
2. Is it revolutionary in it's styling or it's engineering? đź’ˇ
3. Does it have sexy, agressive, fast, or interesting/curious looks?
4. How is it's character?
5. Does it's looks match it's character?
6. Does it's performance/sound match it's character?
7. Is it reasonably fast?
8. Is it a fire-breathing monster? (Absolutely mad car or a racing car)
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9. Is it a Lamborghini? (Being one makes it automatically Sub-Zero. Exceptions apply though).
10. Is it a recognizable car/legend/head-turner?
11. Does it have some sort of "Surprise/History factor" or any special deed done? ("It has a rotatory engine"/"It's the first 4WD Porsche"/"It, or it's closely related race version won the 24H of Le Mans").
Cons:
1. It has a dull, boxy, or "wanna-be" styling.
2. It looks like it has been riced.
3. Cant manage to make a graceful left-right turn at a corner. (See: Some Muscle cars and Dragsters).
4. It is a "Sober and elegant" car, but with high performance. (See: RR Phantom/Maybach 62).
5. It's an SUV/CUV/MPV/Pick-Up or any niche of the market that resemble one of those. Doesnt apply if it's a pure, purpose built, off-roading vehicle.
6. Cars that dont go outside the box both in styling and performance terms.
7. Cars with lazy engineering (8.0L engine developing...250HP! đź‘Ž).
8. Cars that are prone to attract gold diggers (He's driving a Ferrari...maybe i could have his life insurance).
9. Heavy cars.
10. Cars owned by bussinesmen or anyybody that would produce a boring and uninteresting conversation.
11. Ford cars. There is a reason why Henry Ford is criticized and is a god-like character in Aldous Huxley's "Brave New World", and unless it's a race car, a Ford GT, or a muscle car, this rule deems it automatically seriously uncool (Much like "Pro" rule #9).
I select the rules (the Pros and Cons) that apply, add them and take that as 100%. Then i work out the actual "cool" percentage the car has.
<65=Seriously Uncool
Between 66 and 75=Uncool đź‘Ž.
Between 76 and 85=Cool
85-95=Sub-Zero.
Pros:
95-100=Lord Kelvin's Ice Box!
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That's just my opinion
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