 Re: Question about custom mapping.
The engine will respond better on low and midrange rpm with a PCIII and deactivated O2 sensor. If the stock O2 sensor is in, the air/fuel ratio will be about 15 to 1 on light loads, and 13 to 1 or whatever the PC III is set to if a O2 sensor eliminator is used. The figures are verified with an onboard gauge. 
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Busa 08, 18/46T, R-77, PC III, Pipercross filter and speed de-restrictor
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