early this summer i'll be installing a perrin uppipe, turboxs utec, and a cobb tbe. i know that a custom tune is better than the base maps that come standard on the utec, but my friend and his mustang are pretty eager to race me, so im not sure how much money and time ill have to get a good custom tune by then. so basically my question is how much better is a custom tune than a utec base map?