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Moly is stronger and lighter. Cages should only be made from it or .120 DOM. Plenty of people use .90 DOM and it works but personally my life is worth more than $200 difference. If its an occasional track car the DOM is your best bet as its inexpensive and still plenty strong, dedicated tracks cars are still fine with it but you may be concerned enough about the weight to spend the money on the Moly steel.
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