The C8 Corvette ZR1 is reported to be the world's fastest production car under $1 million, reaching a speed of 233 mph. However, its status as the fastest car is uncertain, with some outlets suggesting that other cars, including a Porsche 911 GT2 RS, may be able to outperform it. The Corvette ZR1 and a variant, the ZR1X, are also mentioned in relation to record-breaking speeds and horsepower, but the accuracy of some claims about the car's performance is being questioned.