For example, the car that made "only" 24whp could've made more hp than normal on the stock tune. Hence the reason for the low gain. You would have to look at that cars dyno sheet to know for sure. Ask Martin (I think that's his name). He could tell you how much power that car made stock.
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2007 Cool GXP with Darkside Top, 5 spd, Ebony Cloth, Monsoon with Single CD, Sport Pedals, XM, A/C
Mods - Solo Street/Race Exhaust, K&N Drop-in Air Filter, EDAL