Question about BBE Fusion mufflers

[VetteFantasy]

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. 20190829_195603.jpg

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[chriskinzel]

My Fusion sounds awesome when open. I don’t have a second muffler or cats, and I do have an X pipe. Big difference between open and closed.


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[VetteFantasy]

Originally Posted by chriskinzel

My Fusion sounds awesome when open. I don’t have a second muffler or cats, and I do have an X pipe. Big difference between open and closed.


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Very good to know. Thanks! Not too loud when open? I also have headers and no cats.

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[Paul Workman]

I'm wondering if they're not opening too soon. Maybe try pinning them shut to be sure they stay closed and see if they remain quiet.

[VetteFantasy]

Originally Posted by Paul Workman

I'm wondering if they're not opening too soon. Maybe try pinning them shut to be sure they stay closed and see if they remain quiet.

I wouldn't say it's ever quiet - in fact, both modes sound like the non-Fusion BBEs did.

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[chriskinzel]

Originally Posted by VetteFantasy

Very good to know. Thanks! Not too loud when open? I also have headers and no cats.

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Not to bad. Enough to let people know you have something special under the hood. I leave it open on the freeway and have a normal conversation in side.


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[XfireZ51]

I have the FBI version of the Fusion system. Full open is most definitely noticeable as deeper, louder than closed. The C6 ran w/o resonator which was partly the purpose of the NPP valves. In place of resonator, using SW X pipe.
Very mellow at cruise and trailing throttle.

[VetteFantasy]

Originally Posted by XfireZ51

I have the FBI version of the Fusion system. Full open is most definitely noticeable as deeper, louder than closed. The C6 ran w/o resonator which was partly the purpose of the NPP valves. In place of resonator, using SW X pipe.
Very mellow at cruise and trailing throttle.

Very interesting...do you have SW headers as well? That's what mine are.

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[RussMcB]

Is your existing center muffler the original stock piece? If so, it is pretty restrictive, and probably doing a lot of the noise reduction now.

[VetteFantasy]

Originally Posted by RussMcB

Is your existing center muffler the original stock piece? If so, it is pretty restrictive, and probably doing a lot of the noise reduction now.

I believe it's the Billy Boat center muffler. I think there must be a reason they offer the Fusion mufflers with the X instead!

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