Not much of a race: X-type vs S4

I'm comin home from work(I work at my uncle's house, doing some electrical work and painting) with my uncle in his brand new Jaguar X-Type AWD 3.0L V6, and I pull up to a stoplight, 2 lanes, which shortly after changes into 1. I'm driving, my uncle "likes to be driven" rather than drive, which is fine with me(hell I get to drive a jag!). Up beside me pulls what looks to be a late 90s(bodystyle just before the current) Audi A4 with a middle aged guy drivin. Light turns green, I give it a fair ammount of gas and jump so the Audi's nose is at my rear wheels.
Just as I'm starting to lay off the gas(I just wanted to get in front of the guy for the merge), I hear the beautiful sound of a spooling turbo, and before I have time to think "Oh shit...", I'm starin at the S4 badging on the back of the car. The best part, after he passes my uncle turns to me and says "You let an Audi pass you???"
I love how Audi really makes the S4 a sleeper. The only major difference between the A4 and S4 externally is the little red badges.
Like I said, not really a race, but I enjoyed it.

Yeah, S4's are quick as hell. The rims on the S4 are different from the A4 as well.