I bought a 5spd last year for $750 from a dismantler. It had 60k miles and is not perfect but far better than the one that came out. Maybe sharpen your pencil a bit. There are piles of these things at dismantlers all over the country.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
I have a 99 and it is my understanding that it is rather involved putting a 6 spd into a 99 since they were all 5 spds. Axles, suspension, etc do not match up. Do you have any info on this. Bill, Pgh, pa