Date registered: Oct 2010
Vehicle: 300CE-24, W204 C220 CDI, W210 E55 AMG, W124 300TE, W163 ML270 CDI
Location: Melbourne, Australia
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The Primacy is supposed to be a 'reduced noise' sports tire, but it doesn't seem to be the case. Try the BF Goodrich g-Force Sport, they are good performance tires, they should be in your size. I don't know if you can get them there you would have to check that.
Other tires you might want to look at are the Michelin Pilot Sport - The C220 I have rides on these, the noise control is quite good.
All I can say is, before splashing money on a new set of tires, try and determine why there is such loud noise from the tires, they aren't the quietest tires in the market, even for a sport tire but if I were you, I would shop around for an expert's opinion (although they may try to sway you into a purchase with the wrong or misleading information)
The tire shop I go to lets me test the tires if I am seriously considering between a few. I don't know if you could be so lucky though.
Hope that helps. IMO 80% of the roar is due to the tires, the 15% would be road surface and 5% to suspension geometry. Please correct me if I'm wrong.