20k is a long time for rear tires
also the factory tire pressures are calculated to add understeer
if the tire is wearing evenly, it is not over or under inflated
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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