Originally Posted by Chuck33079

If both sets of MAFs were OEM, it makes no difference which set you use as long as they are clean. There may be some differences in the intakes, and personally I'd have it retuned to make sure I'm not running lean. You probably aren't, since the IATs are much lower with the new intakes and the ecu isn't dumping fuel to keep the temps down. I'd just do it for peace of mind. Unfortunately, I would also use the retune as an excuse to buy more mods, since I'm getting it retuned anyway. Your Uprev license is tied to the car. You can get retuned at any other Uprev tuner.