The CU2 OEM speakers are Alpine. Yes you would get an improvement just by changing speakers, as already stated, but much more dramatic difference would be made just by adding dynamat to the door skins.
I'd add an amp as well, Alpine got some great little beauties (PDX) that take up stuff all room.
With the speakers, I believe Alpine type R's would have to be the best bang for buck out there. I am going to but an Alpine system in my Toyota Prado, using type R speakers.
Search the audio forums for more specifics into brands and speaker performance for what you want out of your system (SQ / SPL / or both).
You may want to get a signal processor to upgrade your stock head unit, depending on how serious you want to go. Rockford Fosgate and Alpine make them, they start at about $500.
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