Thanks for the part number listing Gelsenpower.
E90M3CDFR, keep us updated on your progress with this as I'd really be interested in adding this box under the passenger seat and a fire extinguisher under the driver seat if possible.
2008 AW E90 M3 - current
2002 TIAG E46 M3 - gone
1991 DiamondSchwartz E30 M3 - gone but not forgotten