As a general rule of thumb, I always strongly suggest getting any quality filter (A'PEXi, K&N, K-Tuned, etc) over any mushroom foam filter. Foam filters have a tendency to break down over time (heat cycles, climate, etc) and get sucked up. As you can imagine, this causes quite a few different problems. What blower are you running? [MENTION=56]PetefromtheStreets[/MENTION] is a centrifugal supercharger (rotrex) guru, so I'm sure he'd like to chime in as well.
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