Don't forget that the bmw diffuser doesn't come with the CF inlay - that's another £400 extra!
I could be wrong but I think the one from SSDD is carbon dipped or something similar - looks real good though.
2008 E90 330i - Gone
2010 E91 335D - Gone
2014 Audi S4 - Sooooooooo much better than the BMW's and so wish I new this before!