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G Box fixed my 2nd gear grind as well 2.5 years ago now all I have to do is warm the car for 90 seconds or so and shifts pretty smooth into second all other gears were and are fine. From what I've read here the 6-speeds grinding into second is a common problem that G Box has figured a fix which Porsche itself has not. Lots of posts on here about G Box. Good luck.
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