Yes they will pass the sniffer test, I have heard of a number of g37 guys who have been successful in passing the sniffer test with HFCs. The issue you will have is the visual inspection: if there is anything non-stock on the car, the mechanic can fail you on the spot. Granted, not many of them will go over the car with a fine tooth comb but just something to be aware of.
That said, a HFC that has been used and has discolored from heat will not look out of place underneath the car from a glance.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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