Re: 2007 Cayman base with blown motor - repair or sell as roller?
If the body and chassis are in good shape, and you are using it as a track toy, then you could either repair this engine or discuss with Vision the option to swap it out for a larger displacement version of the M97 (with an ECU tune to match). The rest of the drivetrain should be stout enough to handle the increased torque, and larger brake packages are readily available from other Porsche models should you decide you "need" them.
FYI I drove a 2.7/5-speed Cayman on track for 8 years, from novice to instructor levels, and loved it. The smaller engine displacement only became a limiting factor in the advanced run groups, where my driving skill couldn't overcome the inherent power/weight disadvantage. But I could hang on the rear bumper of a GT3RS through turns 1-5 at Mosport (only to watch it disappear on the Mario Andretti straight)!
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Metro NY PCA Deputy Chief DE Instructor