Does anyone know if it is possible for me to build something to mount a 12 in the back dash of my first generation gs300? Has anyone done it that has pictures or details about the install? thanks

 

Any pictures of how it looks from the bottom side?

 

back dash?????

Rear deck maybe, but not back dash.

 

Interesting that you asked this question. I am thinking about doing exactly this in my car.

Another member here, retrodrive, has 2 12" IDMAX subs mounted in the rear deck of his LS400. The way he did it was to bolt on a large piece of wood underneath the dash, and then mount the subs to that piece of wood. He also had to cut the metal to create larger holes. Here's a picture taken from his website,

http://www.cureline.net/lex/

 

Wow! Retrodrive has a really nice set-up