True, but there is a point of diminishing returns. The Euro filter dramatically outflows the charcoal impregnated US filter. No?
I believe there may be a 1-2HP increase by using the reuseable gauze based filtration. But, you do pass more dust.
Is this worth it? Especially considering you get the majority of the available gain from the Euro filter??
Quote:
Originally Posted by Lemans_Blue_M
Tom already hit on the difference between the Euro-spec and US-spec versions of the BMW OE air filter. An since it's made of paper, it's not an oiled filter.
The other two differences are:
a) The modified OE Euro paper filter (that AA sells) is more restrictive than the dry high-performance aftermarket air filters on the market now. Non-oiled (dry) aftermarket air filters use multiple layers of cotton gauze material to filter out contaminates. The dry aftermarket air filters are slightly less restrictive to air flow. They increase the air flow by approx. 50% over the stock paper filter. But...there is a slight downside to using the dry aftermarket air filters. They allow more dust to pass into the engine.
b) The modified OE Euro paper filter cannot be reused, while the dry aftermarket air filters can be washed and re-used for years. (you never have to buy another replacement)
There are many pros and cons to consider, when deciding on which dry air filter you want to buy.  |