1963 Cadillac Owner Protection Plan on 2040-parts.com

Dax Shepard goes full throttle

Dax Shepard leaned on his Hollywood acting friends to fill out the cast of his new movie, Hit and Run, that hits theaters on Aug. 24. (Watch the movie trailer here.) But he wrote the script with his "stars" in mind--a hot-rodded 1967 Lincoln Continental and a Tatum Baja 1000 racer that he keeps in his garage.

The 500-hp club: The room is getting crowded

At a time when fuel economy counts for just about everything, there's still a horsepower war raging in the United States. The number of fire-breathing wedge-shaped supercars and hot sedans and coupes that can pump out 500 hp or better has nearly doubled in the past five years to more than 70. A decade ago there were just two members of the 500 hp club in the United States: the Ferrari 575M and Lamborghini Murcielago.

One Lap of the Web: One lap of the 'Ring in a Lamborghini Cabrera

-- Ever wondered how a 2013 Audi S3 would stack up against a 1983 Audi Sport Quattro on a rally circuit? So have we, but unlike us, Audi actually has the means to make the two cars go head to head. And, of course, they've filmed it all .