You should be able to get inot the low 10's maby high 9's, but I'm not positive. You could always use the old bernoilli equations or just go check out gnttype.org, I think there was an article on there that talks about how fast you can go with which pump and what size line. I know alot of guys taking the stock line into the mid tens and I will be one of them. If you have enough pump you should be good. I am going to go with an -8AN eventually when I get around to it.