The accelerometer based G-Tech does a credible job of logging 0-60, 1/8 mile, 1/4 mile times for about $200. You can use it in any car and it can give shift light info too. If launch and speed trap are important to you give it a look.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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