Just installed some Sony X-plode 5 1/4 3-ways in all 4 doors.. No cutting plastic behind factory speakers was needed for the smaller 5's. I did, howerver cut the screws down (in half ) so they wouldn't bottom out. The sound quality is so much better, even with factory tweets!! $100.00 from Wally-World-- Cheap, but sounds Much Better. Next Small amp & 10" bazooka (which fits perfectly in front of the soft organizer) to join with the limited factory BUMP!