In a word, yes.
Actually only when activated, to reduce the spin will lessen the spark or apply the brakes. Either way you lose when it kicks in. I don't have it on the 97, and would only use it in the wet if I had it anyway. A little oversteer can be a LOT of fun.

__________________
1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13