I want to know is it possible to upgrade the stock Bose system speakers with aftermarket speakers without changing the stock head unit? If yes, what are the speaker sizes for the stock Bose system and will the aftermarket speakers fit without any modifications?

 

6.5" components are the fronts. The backs have 6.5" coxials along the side; 6x9" "subs" on the rear deck.

I know that the 6.5" require some mod to fit in.. You can use the stock head unit with aftermarket speakers.

Black / Black 2004 GcoupeMT. Premium. Splash Guardz.