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Upgrading the intake manifold is not recommended except on heavily modified cars. Why do you keep asking about these obscure parts that don't get modded until you're basically a full race car with 600+whp?
The Ebay o2 can't get ported - there's no material to remove, which is why it's so good.. It is a good idea to coat it, though. If you're doing the turbine housing, you should be doing the exhaust manifold at the same time.
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11.51@117.72 - PMI
11.62@116.60 - Bandi
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