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IFS not only uses the credit reports from experian/transunion but also your whole history and establishments if you have been w/ Infiniti or not. EMployment and salary do help too
I ran into this before when I had a 350Z, they just check how well you're paying your current loan with them (and that you're NEVER LATE), they didn't pull up my credit score at all, they said right away I qualified for tier one.
They pulled all three for me, and took the middle score I believe. Unless your spotless on credit, your not going to get teir 0/1, and with today's loans anything less than qualifying at those teirs, may no longer be acceptable by IFS. I managed to get teir 2 with my crap credit. I think if I would have tried now they would just decline me period.