I decided not to install the coil on my G37. I called BC to inquired about the Swift spring and they inform me that the BC 370z and g37 have two different part #. I was inform that I can use the 370z coil, but it will drop my G37 1.5" even at the highest setting. I only wanted 1" drop for my DD. When I did my research before most major coil company like Tein, Stance, KW, Powertrix are the same part# for 370z/G37. I also read from the forum that people were swapping coils. The first owner is a 370z forum member and decided to part out. He told me that he have purchase the coil brand new late last year. If you continue your research in G37/370z forum you will see that the early version coils have noise problems. As per BC they resolve the problem by altering the top mount bushing.
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