Why add a brace under the front sway bar.

[Scotavo]

If you add a 29mm or larger front sway bar, it will bend the sub frame at its attachment points significantly. The frame is not rigid enough to stop it doing so. Even old A-body and those full frame cars that came after them, the sway bar bends the frame rails the front sway bar leverages against. On the Camaro5 you lose~30% of the roll resistance of any sway bar to that energy moving the frame. The Spohn K-frame brace can be used under the sway bar instead of on the sub frame attachment bolts and still preload the sub frame and make it rigid. The BMRSTB can do so also to an extent, it just bends over the engine instead of under it. It's also easy to fabricate a tension brace, adjustable or not, for directly under the front sway. Among other improvements the car will have a noticeable decrease in body roll, or a smaller front bar will reduce body roll without adding understeer. I've already posted photos of my Camaro with this bracing and this photo is an old B-body full frame car but the principle is the same. Not to be obvious but the square brace does not touch the round 1 5/16" Hellwig sway bar.