I fit 4 OEM sport package-size tires in my Z today. Not safe. Would not recommend. The worst part was I took a turn sort of sharply, which made the 3 tires in the front shift left - one of which leaned on the steering wheel. Rubber tire + steering wheel = no turn, mid-turn. Almost hit someone.
However, I got to the garage in one trip..
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Pearl White 2010 370Z Sport, Stillen CBE, tint, K&N drop-in filters, GT-R start button, Kenwood DNX-6980 with backup cam, LED bulbs, Raceseng shift knob.