Need - no.... Highly recommended - yes. Setting toe values is significantly more important than camber. But adding the toe arms adds a level of complexity that will make tire wear worse with incorrect values. The oem toe arm will allow more articulation with the rubber bushings. The stiffer bushing/inserts will not. As such the tire has a greater chance of scrubing through the corner. Adding to the fact you got some of the stiffest asb's on the market, tire wear is going to increase tenfold if you don't align/corner balance the car to perfection.
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