You probably remarked that your Nissan S13 is really not rigid enough for race application, drag, race, rally and drift require you to solidify your chassis to obtain a good feeling and to keep your front end geometry on heavy condition.
These gussets are designed to be welded on each tension rod brackets to optimize the rigidity of your front suspension and steering.
Each gussets are made of easy to weld 1/16inch ( 1.6mm) thick steel. Weld it, paint it and mount it back.
Every kit included a right and a left gusset ( the SRS logo need to be the good side to be read )
Professional installation is recommended.