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I know that you can turn off the Trac on the IS. In fact you have have the dealer modify the ECU so that the Trac defaults to off. That way when you start the car it's off, and you have to turn it on if you want it.
The VSC I'm not sure about. I'm not sure exactly how often that turns on, it's kinda hard to tell. It might just be hard for me to tell since I'm not sure what I'm supposed to be listening to. I know when I take a crazy turn I hear clicking sounds, and I believe that is just the Trac working extra hard with breaking the front breaks. Does anyone know?
Graphite Grey Pearl / Ivory Ecsaine / OEM Spoiler
K40 front & rear radar / L-Tuned Sway Bars / 28% Titanium Tint / 2nd set of Rims w/ 225 Azenis
If you see Texas plates in SoCal it's gotta be me!