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There are threads on this topic already - search for them. You can refer to my build thread for an example (link in sig), but for FI or if you live in the mountains, I would recommend something with a low pressure drop feature and a size of 11 x 11 x 1.5".
Originally Posted by webworld
... blah blah blah [copied from WikiPedia] ... (followed by plug for compay, totally unrelated to thread)