I think the Yutongs will win. VSO I can't really hear them when
opposite side of road. Yutongs, well, can hear them from my
house.
VSO the noise is only concentrated on the front right side of the
bus, where the radiator is.
for the yutongs, and especially the Higer buses before they
merged/bought over by kinglong, the noise spreads around the whole
rear portion of the bus, where the engine is.
you should have been there when 9844Z revved its engine in
hougang int last year.
everyone in the int, incl some drivers, turned around with the
"WTF WAS THAT!" face 
