I'm with mudski here. My car became a hell of a lot better with dawes and needle. And IMO the CRD factory boost control is still piss poor. It just yoyos all over the place.
When I went to pickup parts from mudski and when he helped me fit my setup. I was very hesitant about it. I wasnt sure whether I will benefit from it. But after it was fitted and tuned, it was a completely different beast afterwards. Boost was more smoother and linear and it dropped EGT's heaps...