Brilliant thread, thanks to all for the wealth of information. I'm kind of torn in that I love the 987.1 CS, but I've been taking my '83 911 to hpde for more than a decade, slower but relatively speaking bullet proof. You could almost make the case for adding performance to the dry sump air cooled beast over addressing 987.1 shortcomings. Almost. Did I mention I'm torn? I already have the 2qt deep sump and accusump, so I guess you know where I'm headed.