[bigislandboxster]

Not sure what would cause a premature failure of your cats....I know on my '98 something was done to modify them to California state law, as that was where the car was originally sold....Look into your countries laws and Porsche to see if you qualify on that....

A leak in the valve cover usually isn't a major thing, but labor costs can be bigger than expected....Cam covers are a different thing, and not so cheap to repair as one might think, I had mine done via my extended warranty, thank God it covered it, as it was almost $1700 to fix both seals. Labor costs were the biggie, as the engine had to be taken off its mounts to get to it....

I'd look into where exactly the leak is coming from, and the cause....