My understanding is that toe is what causes most tire wear. The springs do really lower the front by 1.3 and I haven't had any problems scrapping but I drive slow and carefully. You will probably scrap If you have steep driveways or the driveway that is curved. My z is my daily car too but I avoid steep driveways.
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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts
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