The 95 and up O2 housing are larger, and allow you to port them much larger inside. You can port the hell out of them. You can usually pick one up for about $50 that is what I get them for.
Porting your turbo is a great idea. it will give you better turbo responce and help alot on the top end of the RPM band. Make sure to have the O2 hosing side of the turbo to get all that back pressure out of there.
Call me if you have any questions.
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