I just installed the Valair Street Dual disk (650hp, nonquiet version) and like it so far.
It is not the organic version, so it is grabbier but still manageable in traffic.
I towed about 10k with it as well, and no issues there.
Everything looked to be of high quality in the box, and everything was installed efficiently and as should.
I was on the fence between Valair and Southbend, and every Cummins owner I talked to beforehand (NV4500, NV5600, or G56) said Valair, hands down.
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