Like Cyberium had mentioned, I don't think there are any differences in gains, just sound. As posted on the Fast Intentions website: The RHFCs is "Recommended for the enthusiast who wants to remove their stock cats but keep the sound level to a minimum. This is our quietest option available."
This would be the same as purchasing the non-resonated CBE vs. the 18" resonated CBE. Only difference would be the sound.
I hope I'm correct. Tony, please correct me if I am wrong.
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