As I responded originally anyone who tells you a guranteed outcome is just pushing their brand. If thats the preference here then I'll go ahead and say GT-K is going to outperform the GT35 in every category. Rather then just giving you a pitch I was trying to quanitfy the reason why no one can factually predict the outcome of two different turbochargers on YOUR specific car without actually bolting each of them up and testing them. There are far too many factors at play to make a factual analysis of this. What I can tell you is that I have seen extremely similar cars and set ups with one running a GT35 and the other a GT-K 550 and in each case the GT-K 550 outperformed the GT35 in boost threshold and mass flow rate at equal pressure ratios.
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