If we're talkin' about Energy Suspension's stuff here, I am not sure. I believe their business originally catered to the "Monster Truck 4-inch lift" crowd that goes ga-ga over colorful suspension and steering components.
Everything I've read says they do make good stuff, though.
Glenn Morgan: 66 GT V-Burgundy Fastback 351w+toploader+9 in. TracLoc. Started out as a rusted-out Chicago-area crusher. After sacrificing a solid 66 coupe for its sheetmetal sub-assemblies, I have one solid (and expensive) work in progress!