Yup it is the one circled!
All it's job is to make the engine quieter, it is just a resonator on the airbox. Facelift Focii don't even have one on the airbox, so that shows it doesn't do much. I have been running for 8 months and no problems.
It takes 2 mins to do and is fully reversable so you can try it and see what you think to it.
All it's job is to make the engine quieter, it is just a resonator on the airbox. Facelift Focii don't even have one on the airbox, so that shows it doesn't do much. I have been running for 8 months and no problems.

It takes 2 mins to do and is fully reversable so you can try it and see what you think to it.
Great 1st car 