Guys, relax.
I said a mapped 2,7 / 3,0 TDI would pull away from the naturally aspirated RS4 V8, I never said in what gear, neither did I say it was a drag race.
Despite the RS4's larger capacity, it has a high redline for a V8, and is peakier than the older V8 motors. I've had the pleasure of running one, and I've also had the pleasure of running a A6 2,7 TDI Avant auto.
This car was mapped, and despite the Avant weight and power-sapping auto, I was shocked at how much shove it had. I'm no stranger to fast petrol cars, but believe me, the current VAG V6 TDI's are ****** quick, even in stock form.
I can only imagine the 3,0 version will be quicker. Sure, the RS4 will be quicker off the line, but in terms of sheer midrange grunt, a mapped 2,7 / 3,0 TDI will have the edge.
I remember a tussle I had back in 2005, in an RS4 B7. A BMW loomed up in my rearview mirror, and I stupidly slowed to allow it to get within range. I assumed the 5 series was an M5, it caught up so quickly.
My foot was mashed into the floorboards, but this car went past me in a black cloud - it was a 535D, I could only watch as the gap gradually widened, till it was gone. Never saw it again after that!