New o2 housing for 4g63

Is there really any difference if I got a new o2 housing like this one or just left the stock one in place. http://cgi.ebay.com/ebaymotors/NEW-DSM-Stainless-o2-Housing-Eclipse-Talon-4G63-Turbo_W0QQcmdZViewItemQQcategoryZ33742QQihZ005QQit emZ150144004689QQrdZ1QQsspagenameZWDVW
im goin to be putting it with down pipe as well.

Well i will say that i bought i nice expensive one from machv or slowboy, i dont remember, but it is just like that. Didn't notice a bit of difference. Im thinking of purchasing a cheap one off of ebay with the atmospheric dump only cuz i think the sound is cool. But if i could do it all over again i would have just ported out the stock o2 housing and stuck with that.