<< Yes, there is a performance increase. I didn't say there was not. Its just not in the low end. "headsnapping" is not what it feels like... More like go-cart.
I drive a 93' Maxima (with most of the handling mods that I can get for my car) It has a 3.0L V6 160HP. Not fast. In fact its the slowest max... Anyway, off the line I have WAAAY more power that his A4 (this is the "headsnap" effect. He gets me at about 40mph though (turbo). At 37mph, I'm about a car and a half ahead and he is closing fast. >>
My stock 1.8T puts out 150HP, and that thing WILL snap your head off the line, in first AND second gear. A chipped A4, which has ~200 HP, Quattro, and shorter gearing than my passat, should by all means pull even harder off the line than your maxima. Something isn't happening correctly.
I just realized that I'm not sure if your friend's A4 is quattro or not.
What's the topic of this thread again? Oh yeah, CHIP THE A4!! It is an incredible bargain. You won't regret it, unless your dealer decides to void your window warranty because of the chip.