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

The weights add 3 lbs 4.4 oz.  Not a ton of weight but it’s undeeded weight.   Now it was time to send our cross member out for powder coating.

With the fabrication done, we sent the cross member out to be powder coated for corrosion resistance.  We used an OEM-like semi-gloss black.

The final differential mount and central reinforcement.  Not only will bracing this part of the cross member eliminate the differential tearing out of the car, it significantly improves the torsional stiffness of the cross member to help with handling.

The upper control arm mount reinforcement.  This area is significantly stronger and stiffer now.


  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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