Greetings from Sydney Australia, I am in the process of trading in my 2004 2.2HDi Auto Wagon (Estate) for an Exclusive 2013 2.0HDi Auto Tourer. It will be my third C5, the first one was a 2001 2.0i Auto Wagon. My back-to-back test drives confirmed, that the 2013 car on 18s is neither noisier nor quieter than the 2004 one on 16s. Rides a bit different, but again they are at the same level comfort wise. Now,here is the catch: I have spent many hours noise deadening the inside of the 2004 car. I have covered the whole floor starting at the back of the car and finishing at the vertical wall acting as the front of the rear bench base with Dynamat Extreme. I also covered the outside of the wheel arches (under the plastic covers), a large part of the firewall (engine side) and the bonnet (under the original mat). This made the car much quieter, especially on coarse chip surfaces that abound in Australia. And this is the reason, that the 2013 car was not quieter than my 2004 one. I am getting the "new" car (6,000km on the clock) with the 17s, not the 18" wheels that normally come with the Exclusive. This will reduce the road noise a bit, also will make the car ride softer and reduce the fuel consumption. Not huge improvements, but still... I will also do the Dynamat trick - time will tell to what extent. The car will be the quietest thing on wheels this side of $100-150K. It will even beat the 2014 Subaru Outback 2.0D CVT in terms of quietness. In terms of ride comfort it will have no competition. BTW, I noise deadened the 2001 car as well - it brought huge improvement to noise levels. I hope this is of some interest. If so, I will report on my progress. Regards, Mike O