How much difference would 1 make to my RS2000?

I'm currently rebuilding my mk6 rs2 and have found a superchip pluged into the top of my ecu

The car itself used to be Brooklyn Motorsport's demonstrater untill I bought it.

Car has a full stainless and K/N panel filter fitted and I've got a better throttle body to fit onto it also.

What power gains should it make any1 know?