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A six speed tranny is much lighter than an SC tranny. It uses lighter axles too. A 4agze motor definitely has a sweet spot, a range of RPMs where torgue and horsepower are more plentiful. The larger number of gears helps keep you in that sweet spot. 6th gear is an overdrive to enable cruising with the SC off at highway speeds. A 6 speed would improve an SC's handling and acceleration due to its lightness.
Other than the coolness factor, a N.A. MkI wouldn't gain as much with a 6 speed.
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