what about it?

its not an RS500 one but it dont claim to be.

only issue is its a v-band clamp to join to downpipe, not the standard 3bolt flange.

seems to have been adapted on purpose from a cossie exhaust housing tho, a T34 one I think.

it does look like a "T4" in the RS500 sense of the word, ie its a "small T4" size compressor and a "large T3" size turbine.