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Focus ST Cold air intake

Your Focus ST

Pick your year to see what fits.

Every US Focus ST (2013–2018) is a hatchback with a 6-speed manual and the same 2.0L EcoBoost engine, so the same parts fit every year.

+5–12 whp (est.)
Easy$300–$3501 hr
All Focus ST mods

Why do it

A free-flowing filter in a sealed box that still breathes through the factory cold-air duct. More turbo sound, a small gain, and no tune needed.

Tools you'll need

Parts to buy

Double-check fitment before buying.

Before you start

  • The Steeda intake fits every 2013–2018 Focus ST and doesn't need a tune.
  • California owners: check the listing for a CARB EO number before buying.

Video guide

Focus ST Steeda cold air intake install
by CJ Pony Parts on YouTube

The exact Steeda intake we list, on a 2013 Focus ST.

Watch the whole video

Steps

  1. Remove the engine cover and loosen the clamp

    • Pull off the engine cover.
    • Loosen the 8mm hose clamp on the back of the intake tube where it meets the turbo inlet pipe.
    Watch this step (0:52–1:10)

  2. Remove the stock airbox

    • Unplug the intake air sensor and undo the strap on the air scoop.
    • Lift the airbox straight up to pop it out of its rubber grommets, pull the rubber tube off, and lift the airbox out. The front piece of the air inlet just pulls off.
    Watch this step (1:08–1:43)

  3. Move the intake sensor over

    • Remove the 8mm screw holding the intake sensor in the old box, gently twist it and pull it out.
    • Fit it into the new Steeda airbox and secure it with the bolt and nut from the kit.
    Watch this step (1:35–2:00)

  4. Build the new filter assembly

    • Bolt the mounting bracket onto the new airbox.
    • Fit the velocity stack onto the filter, tighten its hose clamp, and bolt the filter into the box.
    Watch this step (2:00–2:34)

  5. Add the fitting and trim

    • Fit the barbed fitting through the bottom of the box with the bolt and two washers.
    • Press the rubber trim around the edge of the airbox.
    Watch this step (2:34–3:05)

  6. Fit the hose and free the hood cable

    • Fit the silicone hose onto the turbo inlet pipe with its two hose clamps.
    • Unhook the hood latch cable from the latch. It has to pass through the new box.
    Watch this step (3:00–3:22)

  7. Drop the airbox in

    • Set the box in place, seat it in its grommet, and connect the hose to it.
    • Tighten both hose clamps.
    Watch this step (3:20–3:55)

  8. Secure the box and the hood cable

    • Screw the airbox bracket to the radiator support with the T30 Torx screw from the kit.
    • Run the hood latch cable through the hole in the airbox and hook it back onto the latch.

    Tip: Pull the hood release inside the car before you close the hood, to make sure the cable still works.

    Watch this step (3:39–4:27)

  9. Reconnect and test

    • Plug the connector and the intake sensor back in.
    • Start the engine and listen for whistling, which means a loose clamp. Check for a check-engine light after a short drive.
    Watch this step (4:24–4:48)

How to know it worked

Did this guide work for you?

Safety first

  • Park on flat ground, set the parking brake and chock the wheels.
  • Never get under a car held up only by a jack. Use jack stands.
  • Let the engine and exhaust cool first.
  • Disconnect the battery before unplugging electrical parts.
  • Wear safety glasses.
  • If something doesn't match your car, stop and ask a shop.

Follow your part's instructions and your service manual's torque specs.