Dodge offers two coupes for 2015 – the muscle-car Challenger and the high-performance sports car Viper SRT. The Challenger is available in eight different trim levels: SXT, SXT Plus, R/T, R/T Plus, R/T Shaker, R/T Plus Shaker, R/T Scat Pack, and 392 Scat Pack Shaker. Those don’t even include the ultra-high-performance SRT and SRT Hellcat models. Depending on model and trim, the Challenger is available with V-6 or V-8 power. The Viper adds a lower-priced GT trim to go along with the top-line GTS trim, while also adding some new packages, colors, and options. Meant to compete against vehicles like the Chevrolet Corvette and the Porsche 911, the Viper SRT has an 8.4-liter V-10 engine and a six-speed manual transmission. Additional performance bits are added to the 2015 Viper SRT, as well.