Are these cars still reliable on tunes?

Just was wondering if these cars are reliable on a tune and some things done to them. I have a k20z3 and had Hybrid Racing CAI, plm headers-no cat, full race exhaust, on a professional e-tune and experienced some problems months later. Engine was at 144,500 miles and the head gasket went. Already seeing bad signs with the oil and coolant mixing and the amount of air that comes from the oil cap when the car is running. I decided to get another engine (used) and got one with 73k miles on it. My questions is, would it be dumb to add my CAI and look for another tuner? Could have it just been a tune? I did have a pop tune but never ran it for longer than 5 minutes lol. Driving around with it was absurd and never used it like that, just kinda got it to see how it sounded. Tuner did warn me about it beforehand and let me know it could do some damage. All of this happened to my engine when I put the car back to stock and unflashed it to pass inspection. Ran like that for 2 months before everything went wrong. I love this car and know when I get it back I won’t be content with the car unless I can tune it again… I did research before and did not see people have problems with them all tuned up like that.