That cam (180) was never intended to be used with a restrictive exhaust system--I'm sure GM "assumed" anyone checking the L88/ZL1 box on the option list would be installing headers before the engine even finished cooling off from the first drive home.
The addition of headers makes it a whole different ball game--and even then, there's definitely better bumpsticks out there--have been for a long time.
Perfect example of "bigger isn't always better".
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