I was just borred surfing the web at work and came across these. I haven't seen many people use them though. Q-Forms Kick Panel Enclosures (Dark gray) Install 6-1/2" components in your 1997-03 Pontiac Grand Prix at Crutchfield.com
Probably due to the price. I bet it'd sound pretty good with the doors and these in the front but i would want them enclosed for sure. It kinda looks like a free air design.
Here's another one.
http://www.hifisoundconnection.com/S...id/0/SFV/30046
This one really makes me want to redo my stereo setup.
http://www.crutchfield.com/S-kALixrs...rt_custom.html