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was wanting to give it a bit of an increase in the ratio just to give it a better launch also while im there. im asking just cos i want this thing to be on the street. if it was a race car i wouldn't care about speed readings.

Just as the title says. Thinking of slapping an lsd in my r31 but that will throw my speedo out by a ass ton making it very hard to drive. Was wondering if the speedo was a gear style speedo how i can work out what gear ratio i would need to replace the original with and where i can buy one from.