I don't believe this is true. "Well......some of the 335i pipes will fit our E89 and some won't."
I believe the length on some 335 pipes are a better match in length for Z4, but they don't have the correct bend/configuraton to connect.
All Z4 induction tracts (charge pipes) have one model number (per realoem). No 335 MY use that model number. All 335 charge pipes follow a convoluted path through a restrictive dual 90degree snorkel leaving the FMIC and then complete the path to the throttle body in plain sight high in the engine bay. The Z4 tract, as shown in earlier photo and realoem graphic, remains low in the engine bay and makes a gradual flow friendly climb up to the TB.
Hope this is helpful.
