The surf pipe will quiet the exhaust note and may help with CO emissions near the back of the boat underway. Helps a lot for emissions on older boats without catalytic converters but not so much on the newer boats. It does nothing at idle when the boat is idling at a standstill and there are common reports that a power loss is experienced, usually is easy to spot as a slower top speed. Many have installed an aftermarket kit commented that they also experienced higher fuel consumption. I’m not sure what Moomba uses but lots of the “factory installed “ systems are sourced from FAE.