I have the Berk CBE with the Berk HFC's. I have zero drone at highway speeds.
From what I've heard from others, the Nismo exhaust is even quieter then the Berk.
You could also try adding just the HFC's and see if that gives you the sound that you are looking for. I had just the HFC'S to start with as I was waiting for my CBE to arrive and It made a nice difference in the sound.
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