Originally Posted by Formula1

Bruce, that noise scared me to death given the cost of this car. I asked my friend who is a 911 mechanic for the past 35 years what the hell it was. He told me it's the chain tensioner and that is of no concern whatsoever.

My GT3 is not a daily driver, so it can be in the garage for over a week at a time. It seems the longer it goes without being driven the louder the noise. However, when I drive it 2-3 days in the row, the noise is less noticable and over course it doesn't do it when the car has been sitting only a few hours upon restart.

I still cringe when I hear it, but I've been reassured it is absolutely normal with no issues.