My warranty would be fine. Just like the warranty on my last truck that was tuned. When I took it to the dealer I reverted it to stock. Just re install the stock line and no sign of a catch can. People tend to freak out thinking gm tries to find a reason not to warranty. My 2018 was tuned and had a catch can. First they replaced my engine and exactly 1 year later they replaced my transmission. Never mentioned anything to me about aftermarket parts.