As Chris Harris makes his way through the Audi RS4 range, it's clear the progression of the high-performance models hasn't always been so progressive.

The original B5 Audi RS4 that hit the market at the turn of the millennium used a bi-turbo 2.7-liter six unit, capable of 381hp. Next came the B7 in 2006, which had a naturally aspirated 4.2-liter V8 good for 420hp. The 2013 RS4 Avant uses the same high-revving 4.2-liter V8 powering the RS5 Coupe that produces 450hp at 8,250rpm and 317lb-ft of torque. They are all very fast cars, which handle well in all conditions thanks to their AWD system, and that are ideal for everyday family use. All have their plus points, but is the latest iteration the best of the bunch? Also, how does it compare to the 6.2-liter C63 AMG? Click the link to find out.