I don't know about the 5-port but I know the 3-port will pull a similar RB 3 port by 20 feet on a 200' straight. The disadvantage is that it's not as smooth as the RB and you almost nned the dual chamber pipe, and another disadvantage is the carb of the collaris, and also the unpredictable quality. I mean you better take the engine completely down and check every aspect of it before buying, or at least before putting fuel in it.