Data systems are wide open and you can literally spend $5k on a cutting edge 4 camera system or go dirt cheap with Harry's or RaceChrono iphone apps and anywhere in between.
The app based systems software is continually being updated and offer lap times, predictive lap, lateral /g comparisons, best lap comparisons, corner by corner comparisons, sector times, water temp, oil pressure, and multiple camera input. They don't do everything a fully integrated race system will but may get you 90% of the way at around 1% of the cost. Best bang for the buck these days. Great tools for driver development.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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