My Z doesn't even have an engine in it yet and I use it constantly. Every time I have to load/unload it from the trailer or just move it around on the driveway I use it. I think there is even a rule in the SCCA rule book that the factory e-brake cannot be tampered with.
Last dyno w/sport 600's 512 whp 470 lbs-tq On 93 octane @ 17psi