a very informitive read. I have done all of these mods to my GU3 and have had no problems as of this date. I had my Daws Valve fitted by Diesel Tech Services and they have done a very good job, it was set to a max of 17psi and very rarely gets to that limit. Although i must mention that they have installed the daws on the other intercooler pipe (near firewall) and they also removed the butterfly inside this pipe, for what reasons i am not too sure.