If you’re looking for some quick power, you can’t beat a good aftermarket drop-in filter. They install with no problem and more often than not are good for a small bump in power. Cosworth has a drop-in for the Mazdaspeed3 that has 10% more air flow over stock and it meets the ISO fine dust test. That means nothing is getting into your motor besides fuel and air buddy! Oh, I also like the fact that its blue…blue is cool..
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