Will make more noise on a derv! That's all you'll get though, there's no other benefits. If you do get one you'll hve to make sure it's up to the boost the car is producing. Tried one on my old 306 running 22psi boost and it was the equivelent of a huuuuge boost leak!dont think dump valve make much of a noise on a Diesel do they? i wouldnt bother to be honest!!!!
hows it going sham? long time no see... got my turbo painted matt grey now..I've heard somewhere before that dump valves shouldn't be fitted to diesels either?
Anyway you won't gain any benefits from it unless you have a bigger turbo/running higher boost etc. All you'll get is the sound, if thats what you want..