It would depend on which one you bought. You may want to specify type of charger, intercooled or not, and brand/model wound't hurt. There is a power adder forum by the way.
Is this on a 4 cylinder or v8, save yourself the stress of waiting for an answer and do a search. and while your at it, read the very top sticky thread
Other engine mods will also have an effect on total output. I believe the performance increase is usually estimated in terms of percentage of total output.