Hyracer - I have retained the stock O2 housing. I did't have the wherewithall to do the O2 housing due to cost and higher difficulty of installation than the downpipe. I was also taking to heart what 3BarBoost said on the forum - that the cat was the major restriction and that the stock O2 housing should be good through Stage 3. Sorry I don't have the link to his message on that. I'm not currently staged, and am planning to wait and see on Stage 2 before I go for Stage 1.
Maxxfab makes an O2 housing that looks nice - it's fabricated rather than a casting and it has support brackets. There's a picture of it on their website.
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