Hi, recently i modified my air box. I drilled some 19mm holes on the cold side of the turbo, i drilled about 18 i think. Has anyone done roughly the same and if so have you encountered any abnormalities ? I get a strange gurgle sound when the revs drop off from idle, i only notice this when staitionary and reving the throttle from under the bonnet. Air box sounds great when in motion, i suppose taping the holes up would solve my query. Any info would help thanx. Cheers.