My datalogs show ignition voltage at wot to be in the high 11's and go up to 13.0 when idling. My question, does this effect what the voltage of the sensors are reading? I was wondering if i added a voltage booster would it cause the sensors to read wrong because the voltage was higher. The same way if i was at 11.8 volts my sensors don't have the right amount of voltage because its lower.

 

I doubt it will bother anything. I am sure they are designed to work on a broad voltage range. Most sensors the PCM uses use 5v reference signals put out by the PCM.

 

Well to start with your well within the exceptable operating range. If you get below ~10V you'll start having problems with the PCM.
Don't know what the upper limit is, but I'd bet it's over 15V.