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The Williams gearbox has the same ratios, except for a taller 5th gear. Also has uprated bearings and casing - for £550 from Renault. Not suggesting you go for it, but just an idea.
LOL which is why only bad boy valvers run a Willy box. A standard one would be better off with a standard box. If anything I could do with a longer box than the Willy; at 145mph on the GPS speedo, there wasnt a lot of revs left before the limiter, possibly enough to hit 150-155 but no more than that.