We just finished swapping my non-Fusion mufflers for Fusions. I'm really impressed with how quickly the valves open and close! However, the difference in sound between open and closed is really negligible - both at idle and while driving. The only point of reference I have is the C6 NPP system, and with that there's a VERY noticeable difference between open and closed.
I opted to keep my existing center muffler instead of getting a new X-pipe with the kit, and I'm wondering if the X would lend itself to a bigger difference between the two modes.
I'm really happy BBE let me specify round double-walled tips! I've been wanting those forever.
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