I was just reading your reply about speedo sensor gearing ..... I just changed my diff ratios from4.625 to 5.13 and loving the change however as you can imagine my speedo now overeads but all my investigations show i need an inline electrical box to apply do this as it seems nissan only provide a gear for a certain vin ..... do you have any aftermarket info for gearing ....... currently I just use a GPS speedo and its fine but interested in any info u may have.