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The general consensus is that the Helene filter is the best. I have the Helene filter, and I love it. Looks very sturdy, sounds good, and has excellenet filtraton.
Unfortunately, Helene no longer manufactures their filter for the n54 motor. EAS used to stock the filter, and then mysteriously switched over to an almost identical Macht Schnell filter.
I'd say go with the Macht Schnell product. At $89, it's slightly more expensive than the alternatives but has far superior filtration and provides a noticeable gain in throttle response and turbo spool noise. That is, if it's almost identical to the Helene filter as I believe. That'd be my choice.
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