Originally posted by: buck
For my 2001 jetta (now driving a honda 

) i had 6.5 components in all four doors. I prefer CDT (even the classics blow away any infinity perfects, and yes i have had both) components as well as focal. The perfect subs would sound good in there, i would recommend 2 10" subs with a good amp. Dont forget that you will need an amp (4 channel) for your components, you will not be able to use the amp that is already in your jetta.
If you plan on installing them yourself hit me up via pm. I did mine all on my own, it was a GIANT pain the the ass but the end saved me alot of money and the system kicked ass. FYI, it is a PITA a big one at that. For installing components on all the doors you will:
1.have fun learning how to remove the door panel (ohh joy that sucked)
2.remove glued tweeter from the doorpanel (sounds easy doesnt it? lol ya right)
3.have to use a drill to remove the speaker from the door, there are rivits there that you will not be able to remove them without a drill
4. Have to either use the speaker adapter (the ones that are already on there that you will most likely break trying to remove) or buy an adapter from sounddomain/crutchfield/etc for $8 a piece (i think its 8$)
5. Then you will have to install the new speakers and rout new wires through the door (if you dont use new wires when you do this, then you are not doing a good job).
This isnt even counting the rewiring and hidingthe wires.....
I dont mean for this to sound cynical but it is rewarding in the end.