I haven't reached out to SW yet. I checked the exhaust a few weeks back, but I want to get her on ramps again and triple check everything one more time, before I go annoying them. Even then, chances are it's not their problem unless there's a massive exhaust leak from a clamp failing or a pipe cracking. So, with the long weekend ahead, I'll check it out again.
I hate to say but, I think my SS hates mods.
When I put my intake on months ago, it threw codes left and right and it ended up being a bad #8 injector leaning out past the tables because it was defective. They also replaced the right side post cat O2 sensor too. I'm wondering, like i said before, if the left sensor is off or touchy. But then...how do I go to Chevy with that? "Yeah, my left post-o2 sensor is bad or too sensitive when I have my catback on, but it was fine when I had the stock system on..."
I might try one more thing too this weekend, by swapping the CAI out and go back to stock. As always around here, the intakes are questionable; so maybe its throwing off some AFR ratios in certain conditions. Plus the intake sounded nice with the stock NPP, now i cant even hear it with the catback. With the intake back to stock; If I do some hour+ highway driving and Mode changing with no CEL's....then maybe the intake was causing a condition. Those seem to be the triggers for the CEL to come on. If I get a CEL, with it back to stock, then it's something with the exhaust only.