Ok so I was wondering since the rear speakers are 5 1/4" would it be possible to make the hole bigger and put in some 6x9's ?

 

Yes, you can make the hole bigger, it's jst a pain. You'd have to cut into the sheetmetal, and then probably even modify the rear deck if Im not mistaken. I was lookin into all that for my 94, since the 6X9 speakers in it werent exactly shaped like 6x9's.