1. The Focus and Mazda 3 engines are amazingly similar, with the Focus using a MAP sensor as opposed to Mazda's MAF system, hence there is no air flow sensor before the throttle body.

2. A silicon reducer is used to connect the stainless steel tube.

3. Any filter with a 3" inlet will work.

4. This is where the filter will be placed, at the fog light level. This focus has a lip that serves as ducting for supply of cool air.

5. The lower part of the tube snakes down into the fender.

6. Here's the inlet tube.

7. The filter is then screwed in place. Gains are similar to the Mazda 3 with peak gains of 10hp and 15hp in the midrange.