what about underneath the load floor,
but on top of the spare tire cover? :dunno:

I've got one coming in less than a month, not sure if I'm going to use my 10w7 I had from my M3 or got with a pair of 8s..but one will be coming soon! :)

From where? If you have good success with it, I suspect several of us would want one, too.

My buddy's shop. They did the one for my M and we were at CES in Vegas this past week, talking about different things we're planning on doing. It will be a one piece fiberglass unit, it won't be $300 and that's what a lot of the e46 guys complained about. I don't know all the details other than it will go in the passenger side rear pocket out back and will be ready in a month or so I would guess.

I'd like to see a one-piece fiberglass box for this car that's below $300 with space for more than one 8".

Like i said, it won't be $300! The one for my M was $550, I would expect it to be in that neighborhood.

This works well with low profile amps. Use rounded allen head machine screws and nuts on top from underneath to secure the amps and make sure there is enough air circulation if they are running at low impedances.