[QUOTE=LS2ner]The GTR has a black box (like the ones on airplanes) and it records speeds, rpms, everything. And on the Jap version (dunno about the USDM) when you start to drive it hard (like on a course) it will ask if you want to engage "Circuit Mode." If you choose yes then the warranty is automatically voided.

iv heard it also shuts off and u must take it to nissan directly