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Won't the car also need an XFi computer?
No. It's a mechanical thing: the different cam profile - lower lift & duration - raises the cylinder pressure and shifts the torque peak downwards, so less throttle is required at low RPM.
It lowers the XFi's HP rating from 55 to 49, but the torque value is unchanged (the RPM at which the max occurs is lower). (EDIT: The cam alone may not be the HP limiting factor - that could be ECU-related.)
A number of people have done similar swaps including GeoMetry on this forum, and 3 that I know of on teamswift.net. I don't think any of them also swapped ECUs.[/quote]
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