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If it's for your 08 then you'll want a 58 tooth reluctor wheel It's a wheel on the crank shaft that the crank sensor gets it's signal from...the crank sensor has a magnet in it and it's signal fluctuates as the metal teeth of the wheel pass the magnet.
so the more teeth, the more constant the signal is I assume?
I don't think more constant is the right term, but I think more teeth gives the PCM a better idea of where the crank is. How this might translate to improved performance, better fuel economy, changed whatever, I don't know.