I bought this FMIC new and paid more than $1000 for this unit and it is one of the best available FMIC's on the market. This FMIC uses the stock connections and it fits the Z4, 335i and 135i.
I can install this FMIC in about 15 minutes on the Z4.
The HPF FMIC was designed and made in the USA and it is built with vary high quality parts.
It is a great deal at this price.