the 370z is a lot more locked up than the 350z so it costs more to do the same things. Companies need more R&D work to get the parts working. You can't change the gearing without screwing up the SRM, Due to the VVEL assembly there are no cams to upgrade, roots blowers are harder to adapt because the throttlebodies are open most of the time now and it would never see vaccum.
Once some good ecu tuning software or a replacement ecu is released you'll start seeing more parts hitting the market.
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