Quote:
Originally Posted by Amnizu
Tons of info on this in the engine forum both here and e90 post. There is quite a bit of spirited debate around CAI on the N54 motor.
The two sides are, if you get tuned specifically for one you can see gains as long as you ensure it is a model that isn't just sucking in hot engine bay air.
Or, the other side that says just get a drop in filter, keep it clean and call it a day.
Personally, I wont be putting one on this car.
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I can't agree with that assessment as there is testing that suggests that the additional heat from the engine compartment is more than offset by the easier breathing.
And, of course, the temperature delta between ambient and the engine compartment pales in comparison to the heat contributed by the turbos.
Neil