I've been meaning to ask the same question. I'm running oem sizes on 18" wheels and my indi put all four corners at about 30psi after a recent tire change. Car handled great like this. Then I tried upping the rears to about 35psi and it didn't take long before a little stomp on the throttle broke rear traction for a split second getting on an on-ramp. I'm thinking about dropping back to 30 all the way around. Anyone else running lower then stock pressure out back?
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