Strengthening and Improving the Geometry of the S13 Subframe With GKTech and ZSM Custom

Next, the pivot bracket is bolted into place using the mounting holes for the rear sway bar.   This tab is temporary and is used for locating the part for welding.  After welding, it is cut off.

The mount is also bolted in place through the existing lower control arm mount.  Locating the mount like this makes getting this complicated fitting part properly aligned easy.

Zac added this spacer and control arm mounting bolt in place to make sure that the mount would not warp under the heat of welding.

After tacking the part in place, the locating bracket was unbolted from the swaybar mounting point and cut off.


  1. Thats some awesome attention to detail. I can only see myself crashing the car on its maiden voyage with all these nice parts. Love the photo documentation as well.

    1. You guys always do it right. Kinda of rare. If I ever need or one of my friends needed some work done or just good advice I would reccommed your outfit 100% Mike. Thanks.

  2. i’ve installed quite a few of the s13 and s14 gktech weld in reinforcement kits (haven’t done the s13 roll center correction one yet) and i HIGHLY recommend this for ALL 240 owners. if you’re dropping the subframe to install solid bushings, its a great time to have the whole thing sandblasted and the gktech kit welded in.

    Personally, i mig weld them, but if someone wanted to pay for the additional time to tig weld (most of the time is spent getting super tight fitment for all parts prior to welding) i don’t see any downside to it in this application.

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