Not a Merc fan but i would go with the Brabus upgrade all day over this.
Steve A - When did you get the IS-F? ....must have missed that! How are you finding it in comparison to your M6?
2011 AW E90 M3 DCT - Current
2010 JZB E90 M3 DCT - Sold
2009 6MT E90 LCI 335i M -Sport - Sold