Was towing 9000lbs Saturday and decided to take the turnbuckle off the waste-gate and see what kind of difference the extra boost made. As before it maxed out at 21 lbs of boost but pulling a hill it would easily rise to a 1300 degree egt and still be climbing. When I returned with the waste-gate turnbuckled it maxed out at 36 lbs of boost and never went above 1100 degrees. The power increase is real seat of the pants difference. Thought this might be of interest to some. DW