Currently i have a intake, bov, and my dp and catback and cat-delete is comin this weekend.... i saw in the www.lancershop.com store the o2 housing pipe that attatches to the dp. I was wondering if that piece is a mod you add if you have a upgraded turbo. Are there any pre-required mods i should know about that i should have if i were to purchase the 02 housing.

And is it true that that thing will add 5whp???? It must make the car sound a ****load louder than right???

Thanks for the help guys