Post by
Coolwhip »
https://forums.nicoclub.com/coolwhip-u13264.html
Sun Feb 10, 2008 4:02 pm
its a divided o2 housing (aka turbo elbow) that seperates the wastegate gas from the turbine gas and dumps the wastegate gas to the atmosphere. This as you stated creates a loud screaming noise emitted from the wastegate. Hence the name screamer pipe, dump pipe, open wastegate pipe, etc.