The GKTech F8X M2/M3/M4, G8X M3/M4 Adjustable Toe/Traction arms work in either position of toe arm or traction arm. Adjustable arms give you the ability to tune your vehicle's rear toe or traction. The lengths on these rear toe arms are fully adjustable to your specs when doing an alignment and with the right adjustments, straight line and cornering of your vehicle will be improved. Using as a traction arm gives you the ability to adjuste the arms to eliminate bump steer and alter other rear suspension traction settings to improve suspension response. The lengths on these arms are fully adjustable and with the right adjustments, you can change the position and pitch of which the suspension rotates on, along with the amount of "anti-squat" of the rear. Using as a toe arm gives you the ability to adjust and tune your vehicle's rear toe. The lengths on these rear toe arms are fully adjustable to your specs when doing an alignment and with the right adjustments, straight line and cornering of your vehicle will be improved. - Feature high quality 5/8" Teflon lined pillow ball rod ends which eliminate the flex found in factory rubber bushing offering a more direct and predictable feel. - 28mm, 3mm wall thickness 4130 chromoly tube with CNC machined ends, TIG welded and e-coated for a long lasting finish. - CAD designed, FEA tested and rigurosly used in our own F80 M3 race car Vehicle Compatibility: - BMW F80 M3 / M3 Competition - BMW F82 / F83 M4 / M4 Competition - BMW F87 M2 / M2 Competition - BMW G80 M3 / M3 Competition - BMW G82 M4 / M4 Competition