This pic makes me think how plain the butt end of our 335's can look. I've got an E92 and have been thinking about a diffuser which may add little in the way of performance but kinda completes the look. Imagine how yours would look with one. Sweet, eh?
You're going to be doing some decent engine mods and like the OEM look. No problem, but I think a little external pizzazz on vanilla (excuse me, Alpine White) would look sharp.