I am looking to collect some info on misfires on Cayman S's. I have just had my warranty claim refused by Porsche because they say my Milltek exhaust caused the misfire. I am wondering how many owners have had misfires, but mainly on zero modded cars?

The cat on the r/h bank of the engine was melted I am told and this was the cause of the misfire. I wonder if the misfire came 1st then that trashed the cat, which means it probably happen again, even now I've got the original exhaust back on. I got the engine log print out and there was 14 misfires from cylinder 3, one or two misfires on other cylinders.

Any info will be of great use, even for my own peace of mind as I'm pretty sure Porsche GB won't change their mind.