Check the load index of the tyres you have on the 18s now. If they were over-specced that 'may' result in a harsher ride. Don't go below the spec for the car in terms of load index, however. Some tyre designs are more compliant, if the tyre manufacturer wants to make them that way. From memory Dunlop tend to be quite forgiving.
I wouldn't go down to 16s. It'll look daft on such a big car, and as mentioned if they're designed for vans due to the size it is VERY likely they will have a high load index and actually be harsher on ride than the 18s!
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
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