Here is what I got from Crutchfield -
> > It appears that replacing the speakers in your
> > vehicle will require a
> > minor amount of modification. You will need to
> > fabricate a mounting
> > adapter. This can easily be done with a router or
> > jigsaw and a piece of
> > MDF. Once the adapter has been fashioned it looks like
> > 6 1/2" speakers will
> > be your best bet for front and rear. I would
> > recommend the Polk EX602A or JBL GTO635...

Crutchfield also recommended an Amplifier, because the original
receiver only have 4-5 watts output? this will cost another couple
hundres dollors...

I looks like not an easy job, I wonder should I go to local
specialist or maybe Good Guy store?

Also, Is anyone know what kind of speaker come with the 2002 EX? I
saw someone is selling on Internet a "08A55-371-210 HONDA CRV WOOFER
UPGRADE" for $38 for the front and $45 for the rear. Are those any
good?