Recently I picked up a low milage 7.3 with factory turbo. For now I'm going to put the engine on a stand and go through it. I want to put the turbo on my na 7.3. I have read a lot of posts about the up pipe not sealing and I want to be proactive and find the best way to seal it. I can think of three possible ways. #1 Welding it the only down side is no room for expansion. #2 putting a low profile exhaust donut like on the power strokes.#3 stove pipe sealant that would be the last option because it seems like that blows out more times than not. The pipes have a some what of a tight fit not too sloppy there is some soot on the connection but not excessive. Tell me what you guys think I'm open to any ideas