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

Zac is a perfectionist,  He prefers to keep the fit of parts tight so he can use finer welds with less heat going into the parts.  While it would be easy just to zap the parts together with a Mig welder,  Zac used a bench grinder and an angle grinder to hand-fit some of the gussets to minimize the gaps so he could do fine welds on all the parts.

Here is a gusset after hand fitting, nice and tight with no minimal gaps.

After hand fitting, Zac tacks the gusset in place.

Here is the gusset after tack welding.

After fitting, Zac tacks all of the suspension pick-up point gussets in place.


  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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