I'd say leave the diesel alone. As far as my ol' skool knowledge of diesel engines goes, they don't really need a pressure release because they don't use throttle butterflies to increase engine RPM.
When you hit the throttle, the fuel rail opens up and sprays more fuel in. More fuel = more power and thus acceleration. Turbo spools up and pushes more air in.
Different to petrol engines where your throttle is connected to the air intake (basically) and more fuel is added when needed.
I could be totally wrong. This is how old diesel engines were made. I'm not sure of how modern day diesels work.
pips
Only thing that has been mentioned about a waste gate is hearing it through the GSR induction. No one has mentioned getting a waste gate valve?
Wat is it on the bonalume website then please, its on there home page, Thanks. I'll be honest with you I dont no a great deal how these things work so all you comments are a great help, thanks.
http://www.bonalume.com/scheda_auto_en.asp?id=144
Also, when people say they can hear "wastegate chatter" they are actually referring to the turbo stalling and back spinning, which makes that chopping sound, this can be heard through an induction kit.
This is an adjustable wastegate actuator it allows you to adjust the actual boost levels it is not a dump valve
You can sometimes hear the wastgate depending on the type of car I can certainly hear in on my turbo cinq it is a fluttering noise.