I love the speculation when the facts are already available
Go to
www.realoem.com and compare the specs of the regular N54 from a 335i with the N54 from Z4 35is:
- Whole engine part numbers are different (of course, the oil pans are different). Moreover, the engine part numbers are the same between Z4 35i and 35is !
- Only one of the turbos on the Z4 35is has different part number, the other one is the same part number, which means the turbos are the same specs as the regular N54. Moreover, the turbos between Z4 35i and 35is have the same part numbers.
- Engine blocks and pistons have the same part numbers
- Cylinder heads have the same part numbers
- High pressure fuel pumps have the same part numbers
- Injectors have the same part numbers
- Spark plugs have the same part numbers
- Intake manifolds have the same part numbers
- ECUs have the same part numbers.
Sorry to rain on your parade, guys...