Sport, the reality is that my combo is not germane to the original question as asked. What is the biggest(I should have qualified it to 1000cfm and up) 4150's that are really flowing the claimed numbers... that is all I was trying to find out. I am thinking that I'm probably not the only person on here that is curious about what carbs talk the talk and which ones really produce. I may or may not go to a single four at some point, but was really just trying to gather info from guys who might know that info. It really was that simple until everything got off track as they tend to do. It was just a simple question that went south. Thanks for the reply!