Existing speakers for stock 04 grand prix are 6.75" mids and a 3/4" tweeter. These are components with basic filters on the stock wiring. However, not all 6.75" mids work. I had some Pioneer 720prs mids I wanted to use but didn't feel like fiddilng with the factory speaker pod/mount.
One time I had put together an enclosure made out of tubber ware sealed to the back and hardened with an expoxy. I forgot to measure the factory cut out and it didn't fit. I didn't feel like working any more on it so I trashed the setup.
