I don't like the engine sound roaring into the drivers cabin. I have seen some Khyber and Margallas which you know are old enough, thier engine are very silent as new cars which produce a great feel of comfort. And I have seen many Margallas and Khyber of the same models whose engines are very noisy and produce much noise in the driver cabin. So, my question is what is the difference and please give some tips to reduce engine noise. Thanks in advance for the TIPS