NN you will need to get the hi-flo intake installed before you can get your A/F set. Even if you get it close without the hi-flo, as soon as you put it on, you've changed the dynamics of the way the engine breaths and you'll be lean again.
From all my research on de-catting the stock headers, there is no gain or change in engine performance, just a little more exhaust note.
The de-catted header and the V&H are no where near the same. The stock header was designed to have the cat material in there to get max flow, once the material is taken out, the flow dynamics inside the chamber have changed. The V&H was designed for max flow with out cat material inside.
I run the Mastertune TTS. I was looking at decatting the stock headers or spending the $$$ on new headers or crossover. After reading through the pertinent information, there is not enough gain of bang for the buck to go with new and the time spent to decat with no gain was not worth it.
Retired Navy Chief