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They do make them, but generally not for our class of cars - as they would not be very cost effective, performance wise.
Keep in mind that the axle's centerline is closest to the center of rotation. This will have very little affect to rotational mass compared to say, a lighted flywheel. Moment of inertia is proportional to the square of the radius.
The people running big power would trade overall axle weight for strength here. The CV joint will always be the weak point in this setup, regardless. Even between the heaviest and lightest axles, not a whole lot of difference to be made.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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