Get this sorted ASAP. The packing has gone and the carbon is takign the heat. This happened to me on the 996 but I didn't notice it. Half way down the back straight at Nogaro I blew a hole in the exhaust and shot carbon everywhere
I then had to repair it with Redbull cans, gum gum exhuast tape and some jubilee clips. Cook for 20 minutes over a BBQ and serve
Anyhow, back to the point being make sure you don't leave it too long or you'll end up with a hole like I did
