Quality tried and tested Air Filter Kits dont get any better than the new R-Sport Fiesta 1.0 EcoBoost system from Pumaspeed.
first used and developed on the Pumaspeed 205bhp Tiny Titan 1.0 Fiesta this unit is the one to have.

Google Pumaspeed 'TINY TITAN FIESTA ECOBOOST' and see what you find. Way back in 2013 this car ran a stock ST180 into the dust and set speed records 1.0 fiesta havent beaten since. 156 mph !!

This air filter kit has a Fully CNC machined MAF Housing with perfect internal bore size to match the original on the 1.0 fiesta.
An Over Sized Group 'A' style Filter element
Mandrel bent alloy pipework with no internal restrictions.
Increase in dump valve and induction noise

 
The very small 1.0 EcoBoost turbocharger needs all the help it can get ,this beautifully hand crafted R-Sport air filter opens the air system and adds turbo noise to the car.
Prooved to well over 200 bhp this is the only air filter the 1.0 fiesta will ever need.