headers really dident change the sound of my car much. Now, about the maf, Not as much as pegging the Maf, i woudl be worried that it limits airflow, and puts a restriction into the intake tract. Look at the stock maf, it's really small where air can actually flow, now go look at say a c+l, it has no restrictions. So, if you goto a larger maf, and say keep your 19's. It will flow much better.