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If you have a 'TC Off' or 'PSM' Button on the dash you have traction control. I am not sure it would affect the performance that drastically.
I think your problem is that you are running one of your tires -10psi from where it should be which will affect all kinds of things like mpg, speed, stability, etc. Repair or replace the tire.
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1999 Ocean Blue Metallic Boxster - blueboxster.com
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