As long as the piggyback is providing the proper mixture, I do not see a problem with it. Since SAFC-2 has real time data on screen, would it not be a good idea over emanage in that aspect?
On a side note, I assume only things necessary to boost the KA are, turbo, lines (need to drill oil pan hole for return line? where does the pumped line in to the turbo come from?) injectors, down pipe, manifold, intercooler and piping?
I suppose I have some searching to do. It is probably best to just get another KA and rebuild it first, as I have no idea the overall quality of my current that I just got.
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