Ok, so I've got a 5hp flathead briggs and I will be upgrading to a billet rod and a new header. I am looking into what carb to upgrade to and I am currently considering the PZ22. I am looking for a carb that effectively increases HP and is also relatively easy on the wallet. I have heard that the PZ22 is poor in air flow but I do not know how true that is. Does anyone have any suggestions/comments/recommendations that may prove useful while making this determination?