Now i realise it really comes down to what percentage the speedo would be put out, but i figured from standard, it wouldnt really be that spot on anyway. Would anyone have an indication on how accurate the standard speedo is (obviously it wont be the same for every car) just a ball park figure.
Also if i put my cars speedo out by approx. %11 would i really need a yellow box. Would it make that much of a difference, would it be noticable????
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