Porsche Cayman S Cracked Spark Plug Ignition Coil
Upon changing out the spark plugs of my 2006 987.1 Cayman S, it was found that several of the ignition coil modules had cracked. The OEM replacements are much beefier. Note that this was regular maintenance check on my car with less than 40,000 miles on it (car is now just over 40,000). It's worth checking per maintenance schedule by time and/or miles.
In the photo below, the OEM replacement coil is on the left, original on the right. In photos further below, the cracks are visible.