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Just finished 2 track days with Sumi HTR ZIIIs and I was very pleased with them. The car was pretty neutral and I didn't see much if any understeer until after several sessions and they were really hot, much hotter than you will probably ever see with street driving.
If you are seeing a lot of understeer, try adding a few PSI to the front tires. Porsche builds in understeer with the factory pressures.
Also look at the alignment
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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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