I am very new to tuning and I don't want to make to drastic of changes to relatively stock vehicles... looking for some heads up on a 2012 G37, the car has a cold air intake and cat delete along with full exhaust system. (manifold back exhaust system). so far I have disabled the emission codes for a cat delete. I understand the main area these cars gain power is from fuel and air? I was told the pistons in these cars do not like aggressive spark advance. what should I adjust first?
I do have a log file of one 10mph to 80 or so pull, also have a hpt. file I will share when I'm at my other computer