Same here. The cabin noise is most irritating at higher speeds above 80kph; have'nt tested above 100kph, noise could be unbearable on a long drive. Also the floor vibration on the front passenger side is quite noticeable. Don't have this issue with Honda, Toyota suv. Booked the Proton X50 Premium on high expectations and paid for it without test drive. Not sure what causes the excessive cabin noise and vibration but need to dampen it to enjoy the ride and the audio. Anyone found a solution yet?