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      08-14-2019, 09:30 AM   #5
gjm120
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Drives: 2013 128i
Join Date: Jan 2016
Location: East Texas

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From this thread....

https://www.1addicts.com/forums/show....php?t=1079383


The M3 Guide Rod is forged aluminum with inboard ball joint and outboard rubber bushing. The forged bodies of the LH and RH arms are identical but installation of the bushings makes them handed. The bodies are curved (downward), not for installation clearance issues, but to ensure that the compressive failure of this member will be by progressive bending. The ball joint used at the inboard location effectively doubles the stiffness and halves the deflection under axial loading versus the OE Guide Rod, which will alter (and presumably decrease) compliance steer effects.

Also from post #72 is discussion about wrong installation.
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E82 / Ver Red / Blk Boston L / BMWP Springs w/ Koni Yellows / M front control arms / M rear guide rods / AT / Sport seats & steering wheel + paddles