Quote:
Originally Posted by ilikebmxbikes
An s54 swap is not legal in CA for a street car. It will never CA BAR because the motor is from a platform older than the chassis.
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If the S54 came in a 2008 Z4 M, why can't it be legally used in a 2006 or 2007 E90? I thought the motor just had to be the same year or newer.