I am very much disappointed by purchasing brand new factory fitted CNG aura car in Feb.-21. From very first day noise comes from CNG kit assembly. I couldn't imagine that I have to face this type of manufacturing problem in brand new Hyundai aura car. Not a sound and smooth car. Very much disappointed from poor workmanship even in factory fitted cng kit. Please don't go for factory fitted CNG in Hyundai Cars. There is no reply from HMIL customer care even after frequent mails. This is after sales service of HMIL.