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Except MANY race classes explicitly don't allow moving suspension mounting points or tubular subframes but will allow custom control arms. Not to mention a tubular front subframe would likely be 2X the cost of control arms.
In the grand scheme of things, $500 control arms are pretty cost effective though considering they allow adjustment of roll center, caster, camber, anti-dive, scrub radius, SAI, and track width while eliminating the soft rubber bushings.
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