Air Intake for CLK320

Hi all, Has anybody ever bought any of these air intakes for Mercedes on eBay and other places? Are there better than the original paper filter? I saw a few of them on eBay and the prices range from $27.00 to $100.00 and
I cannot tell them apart based on their description and/or pictures.
Do they really increas your Horesepower?
Thanks in advance.
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The one that look like conical? No, don't do it. It will be loud suction noise. It draws hot engine bay air into the engine rather than cold air from outside the engine area. Hot air means less power.
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