the systems are different. i pulled up pictures of the two systems on mbrp.com and it looks like the turbo downpipe is different. i would suggest purchasing this system and reselling it on ebay or craigslist. another idea is purchasing the downpipe you need from mbrp and then using the straight pipes from the 6.0 system and seeing if you can rig a system up from the parts you have. i have a few links for you: one for the other forum post i was reading about this topic ( Exhaust question, 6.0 exhaust on 7.3 truck
) and this link for the turbo downpipe. ( MBRP Exhaust 4" Powerstroke Down Pipe
Good Luck, let us know how it goes!
2006 Ford F-250
4in MBRP Turbo back off road exhaust T409