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My guess is around 5rwhp. The key is to not expect much with little bolt-ons, then you'll be happy when you drive your car for the first time with them.
LOL that's a good rule of thumb. They publish inflated Crank HP numbers. 6-8rwhp is fair with the UDP though. Just don't get piggyback style pulleys. Steeda for the win!
I don't know about the H.P. gains but I really didn't feel any diffrence when I installed mine. I'm sure there's a gain but nothing you will feel. (I.M.O.)