O2 housing

curious as how the O2 housing with the dump tube works, how does that increase power? and isent it for external wasgate turbos or doesnt matter?

There are hosuings that have an external dump for the internal gate. It simply dumps the WG gasses rather than returning them to the main exhaust in the O2 housing. I dont recomend them for a couple reasons. One, they are twice as loud as a real external gate and sound nasty and harsh. Two, they did nothing for boost creep in my case. I took it off the day after I installed it ;)