Interested to hear about this myself, as my next set of tyres might be D697's.
I'm already on 18's, with Mickey Thompson STZ's fitted. They have been pretty quiet so far, but starting to get a little noisy and have set up a harmonic vibration with something behind the drivers side of the dash as they wear towards the end of their life. Have yet to decide whether I will replace them with more of the same - have a couple of options I'm considering at the moment.
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