The arms are angled inward to allow tire clearanced for tight turns and articulation, you can actually adjust your knuckle stops for a tighter turning radius than can be achieved with stock arms. Extensive testing revealed that heim joints did not give any additional travel or flexibility, and 12" was the optimum length. This is a safe and rugged design with no removable parts or areas for possible failure while driving or in an impact.
This kit with our new Superflex suspension components(below) makes RTI scores 1200-1500 range possible. On our project BULLETPROOF we achieved an RTI score of 1268 with full tire pressure and poly bushings.