My god, what is that thing!?
Im afraid that looks just as tacky as flamer kits do.
Fair enough it may sound like a dump valve, but my point is, it isnt.
the daddy (whatever your name is), Im not doubting you at all. I know dump valves for diesel turbos are the same as for a petrol engine. Just the boost pressure on a diesel is very low. Have you thought about turning up the boost at all.?
I know someone who has a Pug 309 turbo diesel, has a hybrid turbo on it. Hes running about 140bhp, but about 230lbs of torque..!!!!!!!