Under the hood of the RS4, Audi placed a 4.2 liter naturally-aspirated V8 engine producing 444 horsepower and 317 lb-ft of torque. The quattro RS4 runs to 62 mph in 4.7 seconds.
On the other hand, the new F80 M3 sedan uses a smaller displacement unit, a 3.0 liter TwinPower six-cylinder engine developing 425 horsepower and 406 lb-ft of torque. The combination of a rear-wheel drive and 7-Speed DCT takes the powerful sedan to 62 mph in 4.1 seconds.
Basically, the comparison comes down to practicality and performance, and the new M3 and the RS4 Avant might be the best in business when it comes to those.
Here is an excerpt from the comparison review:
Audi RS4 Avant
The RS4 is almost a victim of its own unquestionable quality. Step inside, and you’re greeted with the usual Audi high-quality interior. The bucket seats are comfortable and cosseting, but the interior isn’t far removed from a standard A4, which somewhat dulls the sense you’re in something special.
But then you plant the throttle. The RS4’s Quattro system is unbelievably good; the car simply squats and catapults you towards the horizon. It’s so good in fact, that even in the damp conditions we were dealing with, quick progress required nothing more than a rowdy stamp on the throttle. The Audi’s gizmos would go to work, ironing out any indiscretions your lead-footed nature may have caused, and BAM, you’re away.
Before driving the M3, I loved this fact. It was no nonsense, any time, any place power. But after the excitement of the BMW, the Audi just felt a little lacking in fun. I fear you’d become used to the huge, surging power all too quickly. This leaves me in the awkward position of saying the objectively better car isn’t necessarily the one I’d go for.
This car proved to be a huge dilemma for me. On the face of it, it’s the worse car. Its rear-wheel drive system can’t put the power down, squirming and twitching constantly when you go for the throttle, leaving your nerves fraught after a quick blast. Driving it home from the shoot while it was raining, Matt kept holding back behind me, then planting the throttle until he latched onto my bumper. I could have no such fun; every squirt had to be meticulously meted out, unless I fancied a full-on tank slapper in traffic.
And yet this is the car I miss. It looks awesome, with its bulging arches and pointed nose, and everyone knows what it is. It makes you feel special while you’re driving it, even in town. But most importantly of all, it’s fun. I’ve always said I’d take clinical competence over character any day, but this is the car that changed my mind. It’s mildly terrifying, it’s loud and bloody hell is it quick. I’m a convert.