Drag Racing Tech - What gains have been seen with ASP pulley?

I've dynoed my car before and after a short belt and picked up 3 rwhp peak and up to 6 throughout the rev range. At the track I picked up a consistent .05 and 1/2 mph. What should I expect with the ASP pulley?

its typically worth a tenth and 1 mph.

its typically worth a tenth and 1 mph.

..which ain't bad really :nod:

Thanks for the replies. How much would a short belt work with this mod.