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      09-08-2008, 01:24 PM   #92
335i/335d?
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Drives: 340 m sport individual
Join Date: Sep 2007
Location: The Netherlands

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Quote:
No; I have the aFe intake and the airflow comes in directly from the oem intake "snorkel" which sits right in front of the first cone filter (closest to the front of the car). Although I didn't get it 'wind tunnel tested,' it's fairly obvious that the airflow (from the snorkel) would go underneath both dual air filters and possibly over them as well. So that's really not an issue. And, yes, they are in fact "open" on the top side; the heat shield is underneath them and also in front of them (toward the passenger side); so again, no real airflow impedance there either.
...thanks for clarifying!

so the suface is okay, the airflow is okay. So what is left what can cause the low performace; IAT and intake route (from filter to inlet manifold) The dual cones probably have the same or even worse IAT.
Appreciate 0