NASA requires at least 2"X.120" (at it's thinnest) so better go with at least 2"X.165" for the bends. You can go down to a 1.75"X.095 if you run cro-mo. Not worth it IMO. Silver state and SCCA are very similiar...way more stringent than NHRA or IHRA.
Of course hitting a guard rail at 120MPH is not really as bad as barrel rolling 6X at over 150MPH through the rocks and into a mountain side. Most of the SSCC wrecks I have seen you can't even tell what kind of car it might have been.
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Dennis
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