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#1 |
![]() Join Date: Mar 2017
Location: NC
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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 |
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#2 |
![]() Join Date: Nov 2011
Location: Salt Lake City, Utah
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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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91 ZR-1 Red on Red #922 |
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#3 | |
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#4 |
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Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
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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.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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#5 | |
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#6 | |
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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. Sent from my iPad using ZR-1 Net Registry
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#7 |
Join Date: May 2007
Location: Chicagoland, IL
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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.
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#8 |
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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.
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#9 | |
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#10 | |
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