I've purchased a redhead 4 turn box and used it for a couple years and it was OK. Still it's the smaller box and even with a stabilizer bar mounted I didn't think it was that much difference from a OEM. Started leaking and started to look for something that would last. I get tired of removing/replacing these things. This seems stout enough to handle the weight of the Cummins. And the 3rd gen PSC box is cheaper probably because they don't include replacement pitman arm or shims for mounting. Plus I like the 3 turn ratio vs the 4 turn OEM. Tighter steering.