The following is purely observational and only intended to offer advice, my intention is not to "bash" a competitors product. Looking at the frame rails of this subframe, they appear to be made from 2"x3" tubing which is standard chassis building frame size (as long as it is .120" or thicker) and used on 90% of the aftermarket front subframes out there. I doubt seriously that the rails are the problem. The main crossmember joining the two outer rails looks to be made from 1/4" formed plate. It appears to be completely open on the bottom which would allow the frame to be very weak torsionally. The only other cross tube is the front bar which is way to small (looks to be 1.5" or possibly 1.625") to offer much additional rigidity. Firewall bars will improve the stock or any aftermarket front subframe but I don't think this is the only solution. I agree with Dave that boxing the main crossmember should be the prime concern and would help tremendously. It would be really simple and inexpensive too. Anything you can do to tie the two rails together better will help and if you can get some gussets or better yet X-bracing tying them together you be be on par with other subframes out there.
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