Drop-IN Performance Air Filters
 

ok.. the title says it all.. do they generate any extra hp and are they worth it?

Power that you can feel in your pants? Probably not. Improved throttle response? A tad. I have an aFe intake, and honestly, I didn't notice much of anything except a slightly smoother idle, and throttle response was a bit better, but nothing earth shattering. If I did it over again, I would do a drop in just for good measure of a complete intake.

I've played with the idea myself. I don't know how the ECU on the FR-S operates, but often they can negate the benefits of the air filter. Additionally, you it can cause particulates to enter the engine. So it's a case-by-case basis, and as I said, I'm not sure about the ECU on the FR-S, perhaps someone else in the community can give some definite results.

Personally, I would install one if it had a modest HP gain (even if it was 5-6), and increased fuel economy. Often the performance companies don't have substantiated gains.

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