This goes beyond just catch cans and onto things like cold air intakes, coolant tanks etc. The line from the top has always been "No modifications if you want warranty", especially when talking about track warranty. Other car makers tow this line to the tee without question and so does GM.
It's been a general consensus that certain mods like catch cans, catback exhaust and cold air intake installed correctly will not void warranty. This mis-conception happened from our collective experience at the service departments and resonates to this day except it's never "truly" been the case. Once a major issue like this one is escalated, the company line is adhered to and here we are.
Heck I had a supercharger replaced for a bearing squeal, during a time when I "considered" my car bone stock. I had catback, CAI and catch can. Many others had the same. Then we all go tell the next person that these mods that won't void your warranty and pretty soon it's just the norm. I've told many people that a CAI with no tune won't void your warranty. Boy was I wrong. Now I think I owe GM some money.
