For those who want to know 2025 gmc serria bose system. I would have been happy with just replacing the dash speakers. Dash speakers and rear door speakers ohmed out at 3.8, front doors 2.1 ohms, i went with the crutchfeild recommendation infinity ref 2 ways front and rear doors, kicker 2 3/4 in the dash. Crazy how much difference there was so much clearer now. The bose had a deeper tone to them.