Hey Tabrez,
Maybe the fact that the certis are on the santro and the yokohomas are on a baleno in comparison ?? :P
I have never heard any noise from the certis...but then they are on a merc!
What do you mean by "i feel its compound is hard"? in terms of comfort (apparently not).. so im guessing u mean noise wise?...either way the compound is pretty soft IMO.
I guess a good way of seeing how noisy tires are (trying to eliminate the differences between NVH levels of different cars) would be to go past a wall or something that reflects sound, late at night when its quiet, in a high gear so u minimize engine noise...and then compare... try it out if u have some time.
cya
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