300lb/in to 600lb/in is streetable. The improtant thing is the height. If you get coilovers, don't dump the car so the suspension has room to compress without bottoming out. Adjusting the dampening to stiffer settings will help you with bottoming out as well.
As far as the understeer goes, the general rule of thumb is stiffer rear springs/dampening/sway bar settings more oversteer. So according to that general idea you can adjust the behavior of the car along with some driving adjustments.
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g35driver OG.
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