Yup, will do it, before i stripped and caged my cossie i had about 1000W RMS of stereo in it and the headlights would dim massivley along with the bass.

Sounded ace mind

Could cause weak spark, cause the ECU or sensors to work wrong possibly leaning the car out, or even making the pump run less, leaning it out.

So all in all, not good.

I deffo wouldnt be rinsin out the Drooom n Bayyyyzzz when hammering around in the car, normal driivng only.