so for the diffusor...there's two parts
OEM BMW Performance E90 & E90 LCI Diffusor Pack - 340.00 shipped! AND
OEM BMW Performance E90 & E90 LCI Carbon Fiber Diffuser Cover - 580.00 shipped!
total of 920 shipped....
i want it....
Yes, those are 2 separate items you'd need if you want to add both to your existing rear M aero bumper.
Now, if you get the rear aero pack, it includes the diffusor....but not the optional carbon fiber diffusor cover.
Hope that makes sense. It took us awhile to figure out all this stuff...but I think we got it. Feel free to PM us with any additional questions.