I just tried a pair last night on my Outerlimits w/twin 1000's and Staggered # 6's . The boat was quiet as hell at idle, when i started put the power to it , the boat felt VERY restricted for a few seconds then came into and took off, got back to the dock and one of the center turn-down pipes had blown off. Maybe the pipes were picking up some spray and restricting it ?? The stagged drives are tight, the pipes barly fit. Need to research it more...we're considering cutting them a little shorter, any ideas?