Hi,
As mentioned the Tire is definitely compromised. It should not be run past 70MPH for safety's sake (I wouldn't run it at all personally, that's part of the Price you pay).
A Passenger car Tire is different in that Heat Management is not so much an issue - Less Grip = Less Heat Generated. The NHTSA states that the only way to properly repair a punctured Tire is with a Plug
and a Patch -
http://www.nhtsa.dot.gov/cars/testing/ncap/Tires/images/brochure.pdf . Yet many Tire Repair Shops will use a Plug only.
The problem for this in a Performance Tire is that you increase the Mass in a specific area (the Plug and Patch) which consequently absorbs more Heat (and releases Heat more slowly). This can lead to a Temp related Blow-out.
It's a B*tch having to replace a Tire before it's due, but that's part of the game. The cost of a new Tire pales in comparison to the costs of bent Sheet Metal, and bent People...
Happy Motoring!... Jim'99
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