In 2004, audi decided to replace the previous generation b5 biturbo s4 with a new powerful V8 4.2l N/A. Although the specs look impressing with 340hp, 302 lbs ft.torque and a 6 speed manual, the car is thought to be quick. Despite its weight of 3900 lbs, after being behind the wheel of one my first impression is the car is slow. The start feels slower than the previous s4, 0-60 times are similar for both s4 generations and recently, in Road and Track they compared the s4 with the c55 amg and the s4 quarter mile time was recorded at 14.5s and a trap speed of 100.5 mph. *banghead* This is probably an error and the best time recorded was a high 13.9s at 101 mph. The handling is fairly good, the power seems effortless through any gears but the fun of the biturbo is gone. It became a daddy's car, an everyday car with the power under the foot when you need it. It certainly can do what an m3 does but it is not fair to compare its speed and performance because the m3 is certainly a funnier car to drive. With a price tag starting at 70,000$, the verdict is the b6 s4 is not worth your money. An b5 s4 handles just as good and with a remapped ecu and tighter suspension, it will outperform the b6s4 in every way. If you had 70k to spare, invest 35k in buying an pre-owned biturbo s4, upgrade with bigger brakes, suspension and store the rest in the bank for interest. I don't know what audi was thinking :dunno: An other alternative is to buy a 2001 pre-owned m3 with low mileage (54000km) which goes at 45900$.