I thought that you all would get a kick at this posting on the comp.risks forum:

Date: Tue, 04 Mar 2008 14:58:56 -0800
From: Clark Family <cclark@ix.netcom.com>
Subject: Nissan GT-R sports car recognizes racetrack coordinates and aftermarket parts

Apparently the Nissan Corp. has ruined the fun of aftermarket tuners on the latest GT-R high performance street sportscar in Japan. The ECU is set on a hair trigger and balks at many aftermarket performance upgrades as well as non-factory installed tires and wheels through the run-flat detectors.

But more ominously, the onboard navigation system watches your speed via GPS and recognizes popular racetrack locations. You must scroll through a series of menus and agree to disable the 180kph (111mph) speed limiter. Then after thrashing it on the track, you must take it for a $1000 Nissan High Performance Center safety check or the warranty is void.

Big Brother is your co-pilot.