Ah thats grand then lol may i ask what does an air filter actually do does it increase fuel performance? Also are they expensive or do i need to find one that is a correct fit to the 1.1 sporting cinq?
Performance air filters are more "open" when compared to the normal standart filters and allor more air to be sucked in to the engine.
Fuel consumption should be about the same as should the performances. Only a GSR admission or a BMC-CDA give you some noticable gains in power and torque.
Browse the K&N, Green or any other filters brand and look for the specific reference for the Cento Sporting.