2006 Audi A4 2.0T Road Test

The A4 was originally introduced to us in 1996, and since then has become Audi's best selling North American vehicle. And given what have long been segment-leading good looks, and its "I'm closing in on big time" junior-broker status, it's no wonder it's been such a major league hit. During my week's drive in a 2006 version, I uncovered a critical reason why the car has done so well; its engine.