OK, if you'll allow me to throw a couple ideas at you, here's how I did my MOMO's:
I was recommended installing the tweeter on that corner of the door panel, and glad I did. It looks good and sounds great! It doesn't sound very harsh, as it would if it was facing directly at you.
PLEASE install some sound deadening equipment if you decide to do this right.
Mostly around the MOMO speakers. Do so before you install the speakers, as it will give you almost 2 millimeters extra clearance from the window (this is important with these speakers!)
Also, wrap the speaker cutout in plastic then set your speaker in. It will be a great moisture barrier and it will also give you a more rich sound, as it won't fade away in the door panel.
I bought this sound deadener here:
http://www.mx-3.com/phpBB2/viewtopic.ph ... 7&start=15
and recommend it.
Also, you have to consider what you would like to do with your crossovers.
Some people place them in the door panel and forget them.
here's what I did:
there's a little mount point that holds the panels to the frame. i reused that mount point for the crossovers, then screwed in the other hole to the panel. It is sturdy as everything and (in my opinion) looks sharp, as well as you can adjust the gain whenever you please, with ease.
My 6'4" friend doesn't complain about the crossovers taking any leg space, and it doesn't bug me (5'8", short :( ) at all when I'm driving.
here's what it looks like from the side:
also, running your own speaker wire, get ready for a world of hurt... unless you're just simply much more amazing than myself.
running the speaker wire is NOT my idea of enjoyable... I drilled out some holes out of the plastic mount on the side of the door, and fed the wires through there
but running them through that rubber sheath was not fun... I do believe I ended up tying the speaker wire to a sturdy metal wire or such, and fed it through like that. I don't remember exactly, but I do remember I didn't like it.
I picked up 50-100ft of speaker wire from home depot for cheap... i don't remember how much, but it's not smaller than 12ga, rca. it's in the picture.
I am also running two of Polk's MOMO 2 channel amps. one of them is bridged to a 10" Momo sub and the other is for the fronts. They sound WONDERFUL and bring the most out of those little speakers. Them little guys really pump!
Also to let you know, it's been over a half a year with this setup in my b6, and I have no alternator/starting issues. It is NOT necessary to up the alternator!
I did end up buying a Orbital sealed cell battery. They were highly recommended to me over those Optima batteries, and costed just about the same price. Which is expensive, but you know... whatever...
The best ground mounting point i have been notified as well would be the rear seatbelt bolt.
I think that's my whole two cents.
By the way, you'll love those MOMO's!
If you have any questions with them, let me know
-Kris
)
I know its a bit excessive, but a 4ga kit runs $40-60, and only comes with 17-20ft power cable, and not all of them come with 12ga speaker wire. 
