if I were you I would get the stock or OEM replacement. The reason is the intercooler that is under the supercharger, with the larger pumps blowing holes in them. And that my friend is very expensive to replace.
If you haven't gotten up yet look it up on Needswings he has the original OEM with a little wiring harness to hook it up, or of course you go to the dealer and if they have it pay the big bucks for it. whichever way you decide to go good luck. Jim

and just for information I have a stock factory pump that has been running with my V8, over a year now with absolutely no problems and no failures.