Decided to do a bit of an update post.
Since I bought the car, I made a few cosmetic changes, which included piano black grille and side mirrors to match the black optics window surrounds. I also installed a boot spoiler, and fitted some smoked taillights.
Finally, sourced a 335i rear silencer and M240i rear diffuser. Removed all the sound deadening from the silencer and fitted it with some of those fake ///M CF tailpieces.
I've really enjoyed the car this last year despite only doing about 3,500km in that period.
However, her time with me may soon be at an end. Found a neat M235i which I'm in the process of looking at.