Update -
i tried a set of HTRZ's last week on my car; i used to use these Sumitomos on my RX-7 (old model of tire, same brand). I hate these on my boxster and am replacing them this week. the sidewall flex is intolerable. i've lost most of the 'snap' in the rear end of the car on corners. also, exiting corners, the rear of the car seems to oscillate back and forth before settling on a line. they also follow road grooves like nobody's business.
i can't vouch for the HTRZ-2's as i haven't tried them, but i do not reccomend the HTRZ on this car. back to potenzas.
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