I think your gonna put a lot of time and effort into discovering what i did after owning this car for 2 years and testing multiple exhaust configurations. Loss of power. Now if you were to cut the exhaust off after the h-pipe, or better yet delete the h-pipe and run a 3" y-pipe you might get the results your looking for.

Curious to see how it works out for you though, nothing wrong with seeing what results you come up with.