Depends on a couple things: Do you have to add weight to your car to pass tech? If you do, then a steel screw kit would be fine.
If you're already close to race weight, I'd opt for a set of titanium screws. There are a number of companies that make Ti screw kits for all sorts of TCs. The Ti screws are much harder than the aluminum ones, such as those nasty Associated blue screws. Way too soft, IMO.
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