Brad: Just disregard my comments man and, see Dom on your carbs needs.
We have had excellent results with our twin blade and, i know the folks manufacturing the parts so, like Dom, i don't have to work with the "other' company.
I was Not aware of the BLP bX4 SERIES EXTREME , i dont think that was available when we realized we needed 1200+ cfm from a single carb, 4150 - that series looks really good, suggest you talk to Dom, he's more current then i am as evidenced by the thread.