A couple gentle suggestions:
Open up the engine compartment and look around. When you let the smoke out of a component there are usually obvious signs. Fix those first.
No known 412 error code for a 2001 Boxster. Re-check and get the whole code and it will help greatly in your diagnosis.
Blindly changing parts based on others "smoke" incidents is probably not the most direct repair route. The process of elimination works.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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