APR Audi RS7 Stage 1 Tested: 647 Horsepower, 700 lb-ft!

Tuner cars, those science projects engineered to make already-fast cars truly berserk, are often more trouble than they’re worth. But what if you could make a two-ton-plus sports sedan run a sub-11 quarter-mile with nothing more than a computer upgrade? Wouldn’t that be worthwhile? READ MORE ››

from Car and Driver Blog http://ift.tt/1ADGA3b