hey guys, jst need some help. got a y reg impreza turbo 2000 uk seem to be havin trouble with boost pressure. when the car is on full boost it surges between [0.9 bar] and [0.4 bar] with out liftin ma foot off the throttle. I can only really feel it in 3,4, and 5th gears. Has any one had similar probs, any info would be much appreciated. thanks.