Quote:
Originally Posted by Polo08816
Did your friend have significant powertrain modifications or was he largely stock?
|
Quote:
Originally Posted by harkes
Running ~420hp on his Z4 N54 so not a massive power increase.
|
What's the stock horsepower rating on his Z4 N54? About 300hp? 420hp would be about a 40% increase over stock. That's pretty substantial.
The type of oil used in the rear differential isn't going to compensate for operating that much out of the stock parameters.