2024 Audi RS 5 Coupe

The BMW M4 is available as a coupe or as a four-door Gran Coupe, a sedan/hatchback hybrid similar in function to the RS 5 Sportback. If you can get past its polarizing front-end design, the M4 delivers a more engaging driving experience than the RS 5. The M4 is offered in both rear- and all-wheel drive and can be had with a six-speed manual transmission, an option the RS 5 lacks.

Though most competitors in the category make do with a turbocharged six-cylinder, the Mercedes-Benz AMG C 63 S ups the ante with a twin-turbocharged V8 good for 503 horsepower and 516 lb-ft of torque. This gives it a clear power advantage over the RS 5, though acceleration is comparable with a manufacturer-estimated 0-60 mph of 3.7 seconds. The C 63 S costs a bit more than the RS 5, but for some, having a V8 soundtrack might be worth the extra cash.

Dynamically speaking, the Alfa Romeo Giulia Quadrifoglio is one of the most exhilarating cars you can buy for under $100,000. In addition to its 505-horsepower twin-turbocharged V6, which grants it impressive acceleration, the Quadrifoglio's crisp steering feel and nimble handling contribute to a well-rounded performance character. However, the Alfa is held back by its lackluster build quality and questionable track record for reliability. The Giulia is also only available as a sedan, so if you want a two-door you'll have to look elsewhere.