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How peculiar, do you suggest any major points I should go after first? Other than the ones you've already mentioned

Wouldn't bad connections result in lower voltage than expected rather than spiking? Genuinely sorry if I sound stupid I am not at all familiar with this field. P2504 is for system over charging, P2503 is for system undercharging but that code has since then went away, U0140 is a communication...

I'm not terribly sure, my searches has been quite obscure when it comes to this car. Not a lot of sources covering MS3's electrical problems

Year/Make/Model: 2007 Mazdaspeed 3 Mileage: 186000 Location/Alitutude: Houston, TX Concern: Voltage spiking to 18v intermittently DTC's: P2503, P2504, U140 Modifications: CS cold intake, CS downpipe, accessport, HPFP ECU/Tuning Software: Cobb Accessport stage 1+ Tuner: Is the concern...