Are we talking TC? If so I'd say stick with the kit servo saver, it's a fantastic bit of kit and won't give during normal running. Zak Finlay uses it and wins everything he turns up to these days. I've even seen team drivers of other makes of cars spending out £15 to run one.
Maybe if you're running mod on insanely high grip tracks and your name is Hagberg then an alloy arm has a tiny benefit.
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