What size exhaust housing is this?

[B-Cummin]

I bought a used hx35 and in the process of rebuilding it, i snapped a bolt off in the exhaust side. as i was drilling out the bolt, i noticed the casting numbers, i assumed it was a 12cm housing, but "16" is casted in plain sight. i dont know exactly what numbers mean what. if someone could set me straight, it'd be much appreciated. Thanks

 

[12vriviera]

inside the t3 flange there will be some cast in numbers, thats what the size will be.

 

[B-Cummin]

Thanks man. I'll look when I get home. I saw the "16" casting and thought if its truly a 16, wiry no more than I've got fueling wise, it'd a pig to spool. Maybe, idk. Only used got experience with the HY35.