The 2015 Dodge Challenger SRT Hellcat is a major salvo in the Horsepower Wars, offering muscle-car metal and seriously awesome engines. The 6.4-liter Hemi V-8 makes 485 hp and 475 lb-ft; choose either a six-speed manual or eight-speed automatic. The aptly named Hellcat has a supercharged 6.2-liter V-8 good for 707 hp and 650 lb-ft, with either a six-speed manual or eight-speed automatic. The automatic is faster, hitting 60 mph in 3.6 seconds, while the manual is more fun and still quick doing 0–60 in 3.9 seconds.