I think that the reason you won't see any published power graphs for performance chips on N/A cars in general is that the power gains are very modest and are unlikely to impress. However, that is not to say they are a 'rip off'. What these remapped chips can do is produce improvements in response and 'drivability' by altering the way in which the power is delivered - usually giving better torque in the lower to mid range where we all do most of our 'real world' driving. The remapper can do this by optimizing the fueling and ignition advance without having to worry about producing the good economy and emissions figures that the manufacturer had to. This will generally make the car feel more responsive and powerful but the absolute power gains will be small. I think the cost of these chips is still pretty reasonable for what they offer.

But the bottom line is that if you want more power you are going to have to alter something that increases airflow, like head/valve work and then remap the ecu to increase the fuelling accordingly.

One thing that specifically relates to the Crossfire is the variable length inlet tract system. I don't know if any of the chip companies play with this or not, but altering the way that the system switches between the long and short inlet runners would certainly alter the torque characteristics.

Just my .02's worth...

Simon.