Quote:
Originally Posted by mav1178
BMW may have added improvements in the intake manifold, runners, secondary valves in runners, or ECU tune to remove the need for an intake resonator.
There's many reasons beyond what you can see on the outside.
-alex
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Same Engine, Same HP and TQ numbers, built at the same time... only difference... one marketed as an upclass sports saloon (quiet) the other is a sports coupe, sedan or vert.