I would agree with this. I have the Mountune air box which comes with the MP215 tune, my understanding is it is exactly the same thing except the Mountune one is metal and the ST200 one is plastic. You can buy it separately without doing the whole tune.
The Mountune box uses the stock upper part where the air filter is, and adds a new lower part that has an extra cold air feed which brings in colder air from down low behind the bumper / fog light area. One advantage of both of these is that they are OEM, the Mountune one being developed in close cooperation with Ford.
This air box only adds a small extra bit of sound, which sounds like what you are looking for. However, I did choose to use it with the stock paper air filter to get the extra air filtration after a lot of folks on here reported that it would not detract from the power. I suspect that if you use it with the included K&N type air filter or another panel filter that there would be more noticeable extra sound.
Here's the intake from Mountune-
https://www.mountuneusa.com/mountune-Induction-Upgrade-Kit-Fiesta-ST-2014-18-p/2364-cais-aa.htm
Here it is with the tune added, same airbox as you can see-
https://www.mountuneusa.com/mountune-Fiesta-ST-MP215-Performance-Upgrade-p/2364-215-aa.htm
The Mountune box uses the stock upper part where the air filter is, and adds a new lower part that has an extra cold air feed which brings in colder air from down low behind the bumper / fog light area. One advantage of both of these is that they are OEM, the Mountune one being developed in close cooperation with Ford.
This air box only adds a small extra bit of sound, which sounds like what you are looking for. However, I did choose to use it with the stock paper air filter to get the extra air filtration after a lot of folks on here reported that it would not detract from the power. I suspect that if you use it with the included K&N type air filter or another panel filter that there would be more noticeable extra sound.
Here's the intake from Mountune-
https://www.mountuneusa.com/mountune-Induction-Upgrade-Kit-Fiesta-ST-2014-18-p/2364-cais-aa.htm
Here it is with the tune added, same airbox as you can see-
https://www.mountuneusa.com/mountune-Fiesta-ST-MP215-Performance-Upgrade-p/2364-215-aa.htm