I have a stock M235i diffuser brand new in the box for sale - this diffuser has never been installed on a car, it was purchased from Germain BMW Naples.
I originally bought it as an extra diffuser to plan painting it gloss black but ended up purchasing a BSM car so decided to stay with the stock ferric grey colour.
Asking $100 picked up for it, paid $180 ish i think if i remember correctly.
Feel free to PM me
Thanks