Dodge needs to respond to a recently unveiled 2014 Camaro Z/28. So here is comes – the 2015 SRT Challenger is already on its way. The prototype, code named “Hellcat“, was spotted testing in Death Valey. It is believed to ride some serious muscle – supercharged Hemi V8 (6.2 liter, not 6.4). This will be the last hardcore Challenger model. The power may come close to ant other SRT – the Viper. Around 640 horses.