It is installed and kicks some ass. I like the stealth box a lot. I also had them install a bass control knob. This set up is exactly what I was looking for.
Yes, it sucks that I cannot use the fold down seats. However, there are just two nuts to take off and I can remove the box. So no big deal for those few times I would actually need the fold down seats!
Tim (apparently likes "3" cars)
E90 M3 -- Current ride
2004 GT3 -- Sold
1997 M3/4 -- Sold
1995 M3 -- Sold