I've fitted the original dumpvalve to the car but that doesn't cure things.

This time I did a little video with my phone of the boost gauge, it's in bars. The maximum is 1.5 bar and the yellow line before is the 1 bar mark. This was filmed while in 3dr gear and revving till 5000 rpm max.

http://s945.photobucket.com/albums/a...t=MOV00826.mp4