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I think the writers of Road and Track and Car and Driver along with Bimmer Magazine and multiple other mags would tend to disagree with the assessment that DINAN's "consumer" products are not distinguished but I know that any discussion re: DINAN always seems to create heated debate so I leave this alone.
With regard to the AFE setups, the open systems draws air directly from the engine compartment which I don't feel is a good idea. The enclosed system uses the stock intake track which has a very contorted air flow path and just uses a high flow filter. I think that you might see similar gains keeping the entire stock setup and simply replacing the stock air box filter with a high flow filter cartridge but I don't have any data to support this so I may be just as full of hot air as the AFE system.
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