Your numbers are right on the mark, or even a bit high, for a Mustang dyno and your mods. You can find around 16 hp by removing all 4 cats but after that ….. not even long tubes unleash much more. If you want trophy numbers find a dyno jet. If you want to know how strong your engine really is go down the 1/4 mile and tell us your mph. And yes, a tune is worth it, especially if it's a dyno tune instead of an email tune.

Les