jrich is it possible that the maf error code has something to do with that it is a more accurate mass air meter. It is a brand new velocity meter from PMAS. It has 4 inch opening and I am using this with a 4 inch anderson powerpipe to 75mm accufab tb with 4 inch opening.. Was just thinking that with more accurate mass air meter, it could be giving a low voltage at idle, maybe lower then the stock meter would give. I have heard that with tuning it is good to lower the minimum MAF voltage in the computer to allow for a wider range of readings.. Anyone have to do this??