The cat's aren't designed to handle the power and heat associated with forced induction. That's why most go with an offroad setup when they switch to forced induction.
Not disputing that at all, but how often do you see this issue? Doesn't seem like a ton of guys have had the issue or at least that I've seen on the forum here. Just curious.
I really don't see much of it on here specific to the S500 but remember that the people that post on here are just a small fraction of those who own these cars and modify them.
Any cat? Stock cats only? What about high-flow cats in long tubes? I am stuck with NYS inspection plus I don't want to needlessly pollute for 10 more HP.
Stock or aftermarket will eventually go in my opinion. It may be a while or can happen quicker. It just depends on how hard you drive the car. The more heat and abuse they see the more chance you have of them going.
Extenders?
Hardly at all noticable. Yes you do notice, but it's nothing like the pig rich days of old.
still debating it. I know a guy that works with GMs and says it isnt really worth much to go from cat to catless. Says that kooks green cats only creates a loss of less than a handful of horses.