The XFI I'm looked at has a broken timing belt. I'm told these cars have an interferrence engine, the valves and pistons overlap. Supposedly the valves are bent. I've seen some rebuilt heads on ebay, but I'm guessing they all have the standard camshaft.
I wounder what would happen is I used a rebuilt head with a "standard" cam with the XFI computer? Gain HP and loose MPG? Or are they not compatible and both HP and MPG would go down?