Does anyone have any measurements as to the size of the space inbetween the false and the real firewalls. I want to flush mount my amp, but don't know where to cut or if there is even enough room. Dimensions and/or pics would be greatly appreciated. I need depth as well as height and width.

Monkeyman, almost all of the firewall is only one layer of sheetmetal thick plus about an inch of insulation.

Monkeyman, do a search on Fierosounds posts. I think he's the one that has the subs mounted in the firewall. I know he has a website but I don't know what the link is.
On he's website he shows how he did it.

Loki has done a similar install, also with 10" subs..

the link is on http://www.fieroproject.com/ which, btw, is now up on the new server..

i just finished completing my subwoofer project (and damn im happy,,,,looks good and sounds great)

as i can recall the space between firewealls is about 2.5 inches deep

Check out this link
www.cox-internet.com/fiero

Im slowly starting to get all the info up on the page so if you dont see an answer just e-mail and ask.. I cut into the double-firewall to mount my subs.. JUST BE CAREFULL!!!!!!!!!!! Fuel lines run through the drivers side Also...I wouldnt recomind mounting an amp...You ave to seal it alot.. Big hole.. Iused about 4 cans of expanding foam......Just ask me and ill answer anyhitng... IT DOES ROCK LOUD AND HARD!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I hadn't planned on going into the metal firewall, just through the carpeted one. If I can't make it completely flush, that's OK. I just don't want to mount it to the carpet. I'd like a little better look than that. My amp isn't very thick, so I think that will work. Now I have to figure out a way to mount my CD changer on the other side. It'll never be flush (huge chassis), but I'd like to make it as invisible as possible. I thought about mounting it the same way as my amp (screwed to the metal firewall) but then I don't know how I'd eject the CD magazine. Any ideas???

OK then...The carpet is roughly 3/4" But i would get a sheet of heat resistant dynamat. That wall DOES get hot............