Originally Posted by
phil_focus
it depends on the car, location of filter, type (open cone/enclosed/shielded) and general condition.
Totally. There simply isn't one rule that works for all cars.
We did a test with an ST200 and at idle, medium, and fast cruise the inlet temps were all 'up' on a cone filter compared to a shielded cone, and the standard airbox.
In a car with better air flow around the engine, or more direct ducting to the filter, then I'm sure this would be different.
Never heard of a car failing on emissions because of a cone however??