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I have the H&S XRT and it is awesome the black maxx is basically the same but you can shift on the fly and you can monitor what your engine is doing and you will be able to tune the fuel and timing.
Got one on my 6.7, i love it, great power plus love the options and display screen. Plus they are comming out with a programe called active maxx for it, which is like efi live for our cummins. In my opinion you cant go wrong with it.