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I had a rotofab dry. Ended up throwing it away before I got my ZL1. Rode in a car with a cai with the foam removed and it was bit more noticeable in terms of sound like you want. I think it's from the sealed box. Rotofab is not sealed just presses against the hood and you can't get a proper seal with the hood liner. Like useing a sock for a gasket.
So for what you want out of those two. Cai is the better choice. You can even do some stuff with the sound tube beyond removeing the foam to make it a little louder.
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