Anybody move there single BOC exhaust to dual SOC exhaust on there columbia? I've got a 500 CAT and run flatbed and want to install a headache rack and get the exhaust out of the way. I have a mid roof sleeper 70" w/o cab extenders. Dual 120 fuel under the doors, I have seen columbia's with this set up just didn't know how big of a job it would be to do it right.