Your car looks great!
Love the Alpine/Boston sound but it would be wasted in my Boxster so I did that in one of my trucks. Your wheels look great too but... YOU ARE GOING TO KILL YOURSELF! (just kidding )
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
I painted my grills with caliper paint because it dries fast and was a close match. I'm sure the correct way to do it is sand, prime several times and paint. I did remove mine from the bumper while it was off. I'll redo them some day when I have the correct paints. I actually only painted them because I had the bumper off for cleaning condensers and radiators and decided the grills could use some touch up.