I have met these
guys (HG Motorsports) at various events around SD and they have a history with the Z platform. I am not sure if they currently do Z tuning, but it may be worth checking out. Very nice guys to boot.
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Car Sold! Pleasure being a part of the Z community.
New ride: 2015 GT-R - 647 WHP / 641 WTQ (e85) & 543 WHP / 519 WTQ (91)