So I haven't had the chance to rip off the door panel yet, however I had the bright idea of just straight up asking GM directly. GM of America told me to contact the parts department. GM Canada well... here's their ridiculous reply:
Thank you for your email, however, adding any extra speakers would be considered a modification to original factory design. General Motors of Canada Company vehicles are designed and tested to meet our standards for performance and quality, as well as all government regulations pertaining to fuel economy, vehicle emissions and motor vehicle safety. We do not reco