The Gen 2 raptor frame has a small flaw that can show up when they are used aggressively off-road. The spring tower as it mounts to the frame will start to develop a crack near the lowest attachment point. this section starts to crack and will eventually cause serious damage.
The kit is made from 3/16" thick steel and gets welded in to the inside edge of the spring tower mount where there is no welding to add the support that is needed for long term strength and reliability.
1 right weld in gusset
1 left weld in gusset