It should not happen but you never know Airfilter box is visible after opening hood. It is secured by 3 screws. If you want I can post some pictures on how to remove and clean the filter. To check the box start the car and check the box by you hand if air is leaking or being sucked. As you have said that your friend also drives a Linea MJD for 2 years. You can drive your friends car and you car back to back on a steep incline usually present in underground parking of shopping malls and offices and see if that linea also faces that problem.