funny you bring em up, I just saw a mention of them in a SEMA video from last year but couldn't find any mention anywhere else so I came in here to ask about them... it just seems that with factory castings that can be pushed near 400 CFM there is not much need for more flow (very tall order I know)from heads that cost twice as much. Thitek covers pretty much anything bigger, edelbrock answered a question that didn't need asked, they came out just after the BGE Apache and flow about the same for double the money.