Question about BBE Fusion mufflers - ZR-1 Net Registry Forums

VetteFantasy · 08-30-2019

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 · 08-30-2019

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 · 08-30-2019

Quote:

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 · 08-30-2019

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 · 08-30-2019

Quote:

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 · 08-30-2019

Quote:

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 · 08-30-2019

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.

RussMcB · 08-31-2019

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 · 08-31-2019

Quote:

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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VetteFantasy · 08-31-2019

Quote:

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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08-30-2019	#1
VetteFantasy Join Date: Mar 2017 Location: NC Posts: 52	Question about BBE Fusion mufflers 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 Sent from my SAMSUNG-SM-G930A using ZR-1 Net Registry mobile app

08-30-2019	#2
chriskinzel Join Date: Nov 2011 Location: Salt Lake City, Utah Posts: 167	Re: Question about BBE Fusion mufflers 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. Sent from my iPad using ZR-1 Net Registry

08-30-2019	#4
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,466	Re: Question about BBE Fusion mufflers 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.

08-30-2019	#7
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,685	Re: Question about BBE Fusion mufflers 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.

08-31-2019	#8
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,148	Re: Question about BBE Fusion mufflers 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.