A vehicles "Instant Center" determines it's ability to transfer weight properly upon acceleration. The angle of the upper and lower control arms produces an intersect point that initiates this weight transfer. With fixed control arm mounting points, it is not possible to tune this instant center position in the chassis. Our control arm relocation brackets provide additional rear mounting holes that allow you to alter the instant center by varying the control arm angles. This mod is recommended for any type of racing and should also be performed if the vehicle is lowered to correct the rear suspension geometry. Mounting hardware included. Available in Black Hammertone or red powdercoat. NOTE: When using bolt-in brackets, welding is recommended if 60 foot times drop below 1.70. These brackets in conjunction with our tubular control arms have already produced 1.33 60 foot times!