keep npp closed all the time?
Drifting
Joined: Apr 2009
Posts: 1,617
Likes: 205
From: Westerville Ohio
Of the dozens of threads I've read about the NPP exhaust, this is the first one that ive read that actually wants to keep the exhaust flaps closed. Not sure why you would want to once you get high off in the revs. As others have said, if you were to do that you would be creating backflow into the exhaust and thus losing horsepower.
Just leave them how they are now, as they're not doing any damage or causing any problems.
Just leave them how they are now, as they're not doing any damage or causing any problems.
Le Mans Master
Joined: Dec 2012
Posts: 7,750
Likes: 172
2015 C6 of the Year Finalist
I pulled the fuse the moment I picked up my GS and haven't put it back. To each his own, but I don't find it too loud under any condition. My previous car, a MBZ C63 with the resonator deleted was much louder and even that wasn't offensive. I guess it depends what you're used to.
Thanks for sharing those beautiful photos, I enjoyed them.
They show you have a good eye for composition.
Thread Starter
Instructor
Joined: Aug 2013
Posts: 140
Likes: 7
From: Syracuse NY
I pulled the fuse the moment I picked up my GS and haven't put it back. To each his own, but I don't find it too loud under any condition. My previous car, a MBZ C63 with the resonator deleted was much louder and even that wasn't offensive. I guess it depends what you're used to.
Thread Starter
Instructor
Joined: Aug 2013
Posts: 140
Likes: 7
From: Syracuse NY
So Im probly gonna look for another set of Stock Z06 mufflers to put on instead of my modded set.
In the meantime, how much HP you think is lost when I have the flaps closed?
Also, are the stock mufflers going to be alot quieter?
In the meantime, how much HP you think is lost when I have the flaps closed?
Also, are the stock mufflers going to be alot quieter?
Race Director
Joined: Mar 2005
Posts: 10,399
Likes: 26
From: Austin Texas
Stock Z06 are marginally quieter than modified ZO6 but much louder than stock C6 exhaust.
Thread Starter
Instructor
Joined: Aug 2013
Posts: 140
Likes: 7
From: Syracuse NY
In the diagrams I have looked at for the muffler mod is looks like the perforations in that main pipe are what allow the exhaust to route to the other pipe?
When you do the mod and you close up those perforations, how is the exhaust getting to that other pipe?
When you do the mod and you close up those perforations, how is the exhaust getting to that other pipe?
Le Mans Master
Joined: Feb 2002
Posts: 5,394
Likes: 281
From: cumming ga
Get an after market controller and you will have the best of both worlds remote open and close Sunset orange creations and one more but the name escapes me at the moment. The controller mounts in the left cubby hole drill small hole to run vacuum lines. run wires to front under carpet and your done less expensive than mufflers.
z51vett
Doug
z51vett
Doug
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