I am newbie, but isn't a Stage 2 tune, in my case was looking at the Perrin setup not suppose to throw any CELs? I mean heck they sell it as a set/stage? I could see it if you just threw on a downpipe, or some other mod, and didn't have a tune. Then the OBD could see something amiss. But I thought I would be good to go if I had a tune to go with it? Is this common, getting the CELs even with an access port tune?