Hey Ross,
Just my .02 here.
What if you put the exhaust closer toward the middle of each side of the bumper, for example in the picture above moved more to the left and right four inches and a little farther up the bumper.
But then again the exhaust will be high either way here. Imagine standing behind the car to put something in the trunk with it running. the exhaust would hit you on the leg instead of the foot.
Again this is my two cents for what it is worth. I still love the build and enjoy seeing the progress more than my progress lately.
Timothy