By no means is it impossible to put 6.5's in the doors. I'll be installing mine sometime next month hopefully, but there are 2 different types of plastic speaker mounting panels on the door in the grand prix's. For the 4 door models they have a panel that tilts the speaker up towards the listener, there are a couple how-to's on modifying the existing bezel to install the 6.5's one is on this forum and another 2 can be found from searching on google for long enough. For the 2 door coupe panels atleast in my friends and my cars case the panels are a bit different. They are a flat plastic panel with a ring around them to help seal them to the door. These are a little more annoying to install. My method is going to be creating a middle bezel to go in the current panel and bolt up, then cutting it an an angle to tilt the woofers. As for the tweeter placement if you have 3/4 inch tweeters you can generally mount them in the stock tweeter location or cut a hole in the sale panel. If you have a 1 inch tweeter more than likely your gonna need bondo, some pvc, some very good glue, sand paper and a whole lotta elbow grease, hello tweeter pods lol
