Hi,
Before anyone gets the wrong impression, a nail/screw through the tread and into the carcass of a Tire does a lot more than simply nulify a Speed Rating. The Tire is compromised - period.
At speed, the plug/patch can work loose causing the carcass to disintergrate. And the extra mass which the plug/patch adds produces a Hot Spot in that area of the tire further raising the possibility of a Blowout and loss of control. The only way I would put a repaired Tire back on a performance car is only to buy enough time (read 1-2 weeks) 'til I could afford to replace it.
Considering the cost of repair and accelerated depreciation to the car should it sustain body/frame damage, the cost of the Tire pales in comparison, and we haven't even mentioned the possibility of injury or worse.
Be Safe , and think of the others you share your car and the road with and replace the tire. It's too bad that tires can be struck down in their prime with lots of tread left, but that's just the way it is sometimes...
Happy Motoring!... Jim'99
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