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There are amazing sedans out there from Porsche , AMG and others, but to me they are not sports cars. Not all high performance two door cars are sports cars either. I once had a BMW M6 V10. Very quick car, but a GT , not a proper sports car.
If you could make a 4 door that was as light, then maybe they could approach sports car performance. But as long as they are heavy weight cars they will never be sports car performers. Being a sports car is not just about being fast in a straight line. No Panamera, S65, or BMW 750 is ever going to match my Corvette's road course track times even though they could probably beat me in a straight line
I have both kinds and I would say the Pana is a superb road car, almost a four door GT perhaps, but an RS is a sports car. Shorter, more track focused,less mass.
No. The same reason sedans can't have 2 doors. There are sport sedans....but a 4 door vehicle, regardless of performance, is a passenger car and not a sports car.