ah nice one mate,
i have had my DPF removed and mapped and the car sounds better and performs awesome right now i love it! defo the best thing i did (but i didnt really have a choice as i had issues with my DPF)
lowering on springs just make sure you check/research the ones before you go for them as i got eibach springs for my car didnt really make a difference on the coupe but i saw them on a E90 and they dropped it nicely
my cars the same colour as yours i went for the gloss black grills over the matt ones to match the trim!!
E92 - 325D M Sport