For those who know me and my story, my S4 is finally fixed, it was in limp mode for some strange reasons, but a great mechanic succeeded in getting it as it should be!
Today I was driving on the freeway and an A8 4.2 TDI overtook me, at around 100mph (160kph), I was driving normally but I decided that it would be a good opportunity to test the S4 against a really strong car (I drove the 4.0 TDI and it's a very impressive car!)...
So I joined him and we started to push a little further around 180-200kph (115-125mph)... then I went in front of him and started pushing the car slowly above 210-220 and so did he... on the flat, when I would press full throttle he couldn't get close to me, but then we had some long curves that we took at 220-230 (135-145mph) and it wasn't really flat, we were going slightly uphill... then I pressed the gas pedal to the floor, went to 240 and he overtook me at around 250 in that long curve, that was impressive!
So my opinion is that the 4.2L diesel has so much torque that it's a lot easier for it to accelerate in high speed cornering, hills than the S4 with the 2.7 ... but on the flat, mine can easily accelerate up to 260-270 (didn't get a chance to go more but it can) and I think that after 230 the A8 can't keep up... of course I bare in mind that the car is maybe limited to 250kph, that's why I compare the S4 in the speed zone below 250.
Since the S4 has two catalytic converters (IIRC) if I had a decat and some downpipes, catback, with around 340-350hp, I think I would win in those long curves and hills

What do you guys think, what kind of cars did you have the chance to race?
I remember one on the forum (with an S4 B5, and about 340hp) said he raced an audi S6 (the new one, with a 5.2L engine) and after 3rd or 4th gear he left him behind, the guy in the S6 was astonished
