| has a larger outer profile. I've had a few of the Z1 turbos come to me for this mod and unfortunately if you machine the flanges they come with, you will undercut into the screws holding the flange in place and it will leave a good bit less sealing face. This is the reason we have gone with the process of welding the flange to the housing - screws just wont work very well as they will have a greater tendency to create leaks. 
Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
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