I believe it was tuned, but the car did not come with the actual tuner. I replaced both downstream sensors as those were the ones giving the fault. I was looking at tuners and was stuck between the SCT BDX and the nGauge. I wanted more of a handheld that you can stick in the glovebox so I was...
I have this same setup, and sorry if this has been answered but I'm new to the game. I bought my GT350 Recently and it came with Kooks headers and Xpipe. Now my CEL keeps popping up due to an O2 sensor codes. Did you run into the same issue? Did you have to get a tune to fix it? Again sorry if...