Didn't find the post but I won't be installing it anymore. It seems that I need to beg the dealer for service. I decided I won't get the diffuser just now and will install Remus exhaust system.
Thanks
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:: Current :: Base 220i Sport, Aero package, Avery Blue Matte Metallic Wrap, AC Schnitzer Repro, Injen Intake Evo, Remus Exhaust x4, Performance Diffuser
:: Pending :: AC Schnitzer AC-1 Wheels + Michelin PSS