i can tell you the jetta had more than just a vr6 and a chip.
my car is in the 110mph range pretty easily and easily does 150+ mph. now he did pass me at 80 or 90mph while i was doing 70 and i proceeded to play catch-up...but this was definitely not a car with less than 250whp...as my car is in the 270whp range and weighs less than 2250lbs.
i did have a 180lb passenger...but that isn't going to make that much of a difference...