well maybe the spots in the manual for new serial numbers are a bit of a give-away, combined with the fact that ppl have said they r garbage combined with the fact that the warranty is voided if you turn off traction control or race the car (according to the black box). seems to me that the voiding of the warranty goes hand-in-hand with the fact that Nissan knows the shit is gonna break when its placed under race conditions, which is why they try to deter owners from doing any of that.