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If you fastened pieces of 2 x 4 lumber in there it would still be an improvement. I've seen guys use single round tubes, double smaller round tubes, 1 x 2 cold rolled rec. tubing , 2 x 2 square and 2 x 3 rec. as well as the laser cut stuff. When you get up to 2 x 2 square, 2 x 3 rec. or the laser cut pieces you'd have a hard time telling the difference unless it were a full-time drag or autocross car - in which cas you'd probably have a bit more tubing inside helping to keep things from twisting.



I was curious about the engineering aspect. I figured that at some point the larger sized connectors would be an issue of diminishing returns. The reduced ground clearance and ugly non stock appearance wouldn't be worth the minor additional gain.