How should I run the exhaust?

[chevymotocross]

This week, I want to flip the rear on my Silverado. The exhaust, the way it's routed, is going to be in the way. I really like the setup as it is. I like how they exit 90 degrees behind the tires.

I was thinking cutting out where it needs to be, and having an exhaust shop adapt piping again but higher up obviously.

Also, I included a photo of the hangers used on the tailpipes. I wonder if I can move the exhaust up another few holes but I'm not sure if there is any flexibility?

Also, I guess I could do away with all the tail pipes and just dump it after the mufflers. But, I really don't want to be smelling fumes and hearing drone.

Also, I KNOW my frame is extremely rusty and thin. I am in the process of fixing that don't worry! Here are pics. What do you think?