Without asking anyone at GM, I would guess Humdingah is correct. Corsa does quite a few performance
exhaust systems for GM. They not only make the H2's, but also the Vette's performance exhaust system.
At the moment, I'm too busy at work to check, trying to solve a problem on how to remove and install a certain I-5 cylinder head without having to remove the front cover, working on a 2.4L Sky/Solstice engine trying to figure out what tool can be used to safely remove the front, torque-to-yield balancer bolt, and trying to get a new job. (Lately, spending more time on the later than any of the formers.
)