just fitted a race tech boost to my cossie (4x4 stg1) and when on 3/4 to full throttle it rattles(audible) and fluctuates between 0.8 and 1.2 bar quite rapidly i had a boost gauge in which i swapped the race tech one for and that didn't do it, has any body had similar problems with them like using the wrong diameter pipe, taking a feed from the wrong place or should there be a restrictor in the original pipe some where as i only got about a foot of pipe with the gauge and had to use my exsisting pipe which is a larger diameter.

cheeRS nick.