John:
I don't think that's a totally new requirement. If you look at the Quick Reference Chart at the back of the 2004 Rule Book, it shows that a cage is required under 10.00-seconds, or over 135mph. The 135mph limit also appied to the master electrical cutoff, and roll cage padding in that chart.
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Fred
1994 Formula - 381ci / 300-shot N2O / TH400 / Gear Vendor OD / Strange 12-bolt 4.11 - 11.5@117 on straight motor
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