Installing an aftermarket intake system to your car can be the easiest and simplest way to gain some horsepower – not too many people realize that. To the normal car enthusiast, it’s nearly an essential modification. Intake kits in general improves air flow to your engine and lessens the restriction the stock air box makes. In addition, it’s also one of the easiest upgrades to install – in some cases, easier than an oil change.

Product Overview

This kit comes with all the system’s components including all necessary hardware for an easy installation process.

K&N Filters holds the title of the world’s leading manufacturer of washable performance air filters and air intake systems. They make intake systems and air filters for almost EVERY vehicle you see on the road. With a 1.6-liter Ford EcoBoost turbocharged engine under the hood of the 2014 Ford Fiesta ST, this car is our chosen candidate for a K&N intake test. At the time this specific intake system was not out to the public yet, but luckily, we were able to score one of these kits from K&N for our own testing. 

The quality, appearance, and fit of the K&N intake kit for the Fiesta is spot on. The Fiesta-specific K&N 63-2857 intake kit features a roto molded intake tube, an original K&N high-flow washable filter, custom aluminum heat shield, installation instructions, and all necessary hardware needed for an easy, straight-forward install.

Removing The Factory Intake

From left to right is the sequence in which the main factory air intake components are being removed.

First thing to do when installing something under the hood is to disconnect the negative battery terminal. After removing the decorative engine cover, disconnecting the mass air sensor’s electrical connection, and disconnect the EVAP vent line. The next steps are to remove the factory intake system. Loosen the hose clamps securing the factory intake tube to the turbo inlet pipe and to the factory air filter housing, then you are able to pull out the factory tube. After unclipping the air duct from the core support, you may lift and remove the factory air box.

Some Assembly Required

Now that the factory intake is out of the way, the K&N intake can now be assembled and installed. First, is installing the custom head shield. Assemble the heat shield mounts onto the heat shield and install the edge trim around the outside and the inside of the heat shield – some trimming may be necessary. Then bolt in the heat shield on the core support and the mounts assembled. Remove the air duct from the factory intake and reassemble it back to the core support.

These photos show the main components to the K&N intake kit being installed in order from left to right.

Now it’s time to assemble the intake tube components. Remove the mass air sensor from the factory intake tube. Install the gasket to the mass air sensor adapter, which are all also provided in the kit, then install the mass air sensor to the K&N intake tube. Finally, assemble the mass air sensor adapter, mass air sensor, and 90-degree vent fitting onto the K&N tube.

This photo shows the intake system completely installed and ready for some after numbers on our DynoJet.

It’s time to install the tube into the turbo inlet piping using the couplers and clamps provided with the kit. When installing the tube, make sure all clamps and couplers are fitted properly and are tightened for best results. Reassemble the EVAP vent hose to the quick disconnect union on the engine and the 90-degree fitting on the intake tube.

The K&N high-flow washable filter is ready to be assembled onto the tube using the couplers and clamps provided. Just like the intake tube, make sure the filter is also fitted properly and tightened. After the filter is on, the intake kit is mostly complete. All you have to do is reinstall the engine cover, connect the mass air sensor electrical connection and the negative battery terminal. Once all of those are assembled together, make sure to double check and make sure everything is tight and properly positioned before starting the vehicle.

The Increase

With the K&N 63-2587 intake kit installed on a 2014 Ford Fiesta, even during the mid-summer climate of 90 plus degrees, the results were surprisingly on point. Baseline numbers for the Fiesta ST are 164.5 hp at 5,500 rpm and 170.5 lb-ft of torque at 3,800 rpm. Our Dynojet power testing showed a horsepower increase of 7.2 and 10.1 lb-ft of torque, which puts us at 171.7 hp and 180.6 lb-ft of torque. Now those are some pretty awesome gains for just an intake system!


There’s a lot of things we watch during development to make sure we don’t have any drivability issues once the kit is developed. – Bert Heck, K&N Intake Manager

The experience we had with K&N’s 2014 Ford Fiesta intake couldn’t have been better. The installation was really easy and straight-forward, while the increase in horsepower and torque was well worth the investment. Not only did we get awesome results performance-wise, but aesthetically speaking, the results look amazing too. The roto molded intake tube, original K&N high-flow washable filter, and custom aluminum heat shield, are all very well put together for a nice subtle, yet aggressive, combination to the looks of engine bay.

Additionally, the sound difference was tremendous. With the K&N system installed, the ‘whooshing’ sound helps extenuate the sound of the turbo, which had previously gone unnoticed