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Running a 6MT, had Gruppe-S headers and a tune done by Drift Office running approx 190HP. Added Weir 4.56 gears about a year ago, and though not a huge difference, it definitely drives better (higher into the power bands) so it has a better response and quicker off the line. Tires tend to break loose a little easier. It's been a fun and welcome improvement. I doubt their is a huge difference between the 4.56 and 4.875, If I had to do it again I'd give the 4.875 a closer look.
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