I have a 2004 330xi (automatic) and a 2004 330i ZHP (6MT). I've done several performance mods to my xi (Shark Injectror, K&N CAI, fan delete, under-driven pulleys, and light-weight wheels--no FI), and it's pretty spritely. My ZHP is stock except it's been "Sharked". The ZHP is definitely tops at the high-end, but my xi seems to have more power down low--much more "jumpy" (which I mainly attribute to the 3.46 diff). That said, I NEVER get the traction control light to come on in my xi, but I can easily get it to come on (and interfere with my starts) on my ZHP. Is this is typical? Does it mean my ZHP actually has more power/torque down low than I give it credit for?