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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...