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It might not be available to you but Domex, from Swedish Steel, is some pretty amazing material. It also welds great. We used it to lighten but strengthen the components in the John Deere combines. They do make DOM tubing here is link to web site, http://www.ssab.com/steelselector. I was a product / process engineer in the automotive and agricultural industry. Also followed the tooling and was an old tool & die maker. Been retired for about 5 years just playing with old cars now.Hot roll and cold roll is stronger than that. Hot roll A36 has 36,000 psi yield strength and cold roll 1018 has 54,000 psi yield strength. These are minimums and they tend to be stronger than minimum requirements. DOM tube has 72,000 psi minimum yield strength but I was looking at one of the Material Test Data Sheets for some DOM tube I bought and the batch had yield strength in the 90,000 psi range...::thumb:: This brace can be made to be very strong with these materials.Just to throw in a thought. I would ask PTP what material they would use to fabricate the parts. Regular hot rolled or cold rolled steel has a min. yield of about 25,000. You can double and triple that strength by using the right raw materials. Chrome molly tube and plate would double the strength. Or HSLA Hight Strength Low Alloy welds better than chrome molly and does not require the welds to be annealed to prevent cracks.
When you stiffen up the chassis you for sure will need the suspension to do a better job since you have less body flex the ride could get pretty rough. An example is the Dodge Viper rides like a wagon. With my height I cannot ride in one without turning my head sideways keeps hitting the roof.
Chrome moly 4130 is a little weaker than DOM in its normalized state. I've talked to the old timer welders at the industrial supply store I go to and they say to use ERS70-2 wire and heat the 4130 chrome moly tube to take the chill out if it before welding. I have not used chrome moly for anything yet...haven't needed to. 4340 is strong but more difficult to weld and requires pre-heat, post-heat, etc.
I just hate to see anyone engineer a product and not take advantage of the latest in the steel market. Take a look might be something you can use to make some killer products with.