is it possible to put a custom woofer, with the stock headunit?? how??

 

yes yes it is...

its how i have mine set up....

go to bestbuy its where i had mine installed and it sound way good!

all you need is the wierig kit and the little RCA converter that wiers up to some of the wiers in the back.

 

You should be able to hookup a sub with stock parts shouldn't you? I wouldn't think there would be a problem ever O.o