actually done any work there :-) I have a question for you about the manual controller. How well does it work regarding boost spiking and holding steady boost? I have a large turboed L series engine (it's a 1982 280ZXT) that I have always used a manual controller with. It's a cheap unit, but has always seemed to work well managing large spikes and holding boost. But, there has got to be a better unit than my fish tank bleeder. I recently bought a Turbo XS multi chambered, ball and spring gizmo that sounded great. I gave it to a friend as a gift for his "new" Z32.......it wouldn't work; so much for that idea. I'm thinking there still has to be something better than what I have, so thoughts on your Hallman? Thanks