I'm kinda torn about a 3" O2. I think the exit of the exhuast wheel inside the turbo leading to the O2 housing is the same size as the O2 that comes w/ the Hahn kit. When I pulled my Hahn O2 to put the custom 3" on and the carbon buildup was starting to make it's way outside of the O2 housing onto the flange. This tells me the Hahn O2 has a bigger diameter than the exit of the turbo.
I think you would have to port the section between the exhaust wheel and the O2 housing to really reap the benefits of a 3" O2.
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Hahn 20g (was 16g) w/ DW 650s  , W/M, Custom 3" O2 Housing and some other goodies.
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