scottmech said:If you plan on running 18-19 psi, I would reccomend replacing the O2 housing. This will free up the exhaust, and about 7-10 hp. If you plan on stying with stock boost, I don't think the performance increase would be worth the effort.
If I were you, I'd start with a dp. If you feel you need to upgrade the O2 housing at a later date, you can still do so.
Since you are not interested in A/F gauge, I would not install the extra O2 bung.