Hey guys so I just got an accord 2003, and want to upgrade my audio system, the front door speakers, the tweeters and the rear speakers, what do I need, what sizes? i want to leave the original stereo so what amp do i need, i'll be also installing a 15" bass on it, what do i need please help!

 

www.crutchfield.com will be your best resource, they are very knowledgeable and the customer service is the best! Basically on your car you buy a kit that replaces the pocket under your audio unit, it allows a head unit to fit nicely where the pocket once was, I couldn't tell you speaker or amp sizes, crutchfield is the place for that info.

 

If you are keeping your stock system, and just adding speakers, I'm sure someone here can help you with that. Maybe there is a more appropriate forum, where you would get more response.