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I just weighed some stock 2000 exhausts at right at 22 pounds each. All C5\LS1 exhuasts are the same except for the tips which are insignificant with respect to weight measurements.
Last I checked the Titaniums weighed in at around 14 pounds each.
22 lbs ... thats heavy ... the Corsas must be lighter ...
Yes many aftermarkets are light.
The B&B PRT's (not much to them but a resonance chamber) are very light and weigh right near the Z06 Titaniums, and obviously look and perform a ton better.
The biggest chunk of the "magical" weight reduction on the Z06 was the removal of the heavy runflats and the addition of the titanium mufflers.