If you have the need to peel your face back with speed, Dodge has the answer: the 2010 Viper SRT-10 ACR-X spec racer. It's a track-only, high-output version of the already brutal Viper SRT-10 ACR, and it's set to go on sale this summer. So just how powerful is the ACR-X? It adds 40 horsepower to the stock engine's 600, thanks to 5-into-1 exhaust...read full article