While making a few thousand dollars on property generally deemed to be a liability (i.e. vehicles) may seem tempting, I don't think that's sufficient reason to sell the car at this time.
Unless you have another reason for selling, keep it. You enjoy the Z. That's enough right there.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |