Water pump GPM?

Shogun assures me their pump is streetable. The Moon cover came in and I find the stock pump does fit over it afterall. I'm leaning towards the Shogun and if that doesn't work out well, I can still put the stock ugly pump on. There is also the possibilty of a BBC pump conversion which looks nicer than stock but generally requires a shallower front cover, but maybe something can be done about that, spacers maybe. The only belt requirements at that point would be the pump and the alt, not overly complicated.

If I remember correctly the Shogun was about $179. Add in the plumbing and I think its still not a lot of money to risk if it doesn't work, but we'll see.