NPP question...
Le Mans Master
Joined: Oct 2014
Posts: 8,669
Likes: 2,724
From: Atlanta GA
So you are in the wrong Forum if you have a 2016 but I can answer
So for a 2016 You will need to remove the NPP fuse but more importantly is you have AFM valves behind the mufflers that will need to be moved over to the new mufflers , make sure the new mufflers have the AFM mounts and dont overtighten the mounting bolts or unplug the valves during transfer or you will pop a code
Now if you just made a TYPO and have a C6 and not a C7 , all you have to do is remove the fuse and cap off the vacuum lines
If you have a C7 I would not go with the bullets, stick with the NPP and go with the catless Borla x pipe , a mild to wild switch and a range device to keep the LT I in 8 cylinder mode . I guarentee u will love the sound and spend way less money
Dave
So for a 2016 You will need to remove the NPP fuse but more importantly is you have AFM valves behind the mufflers that will need to be moved over to the new mufflers , make sure the new mufflers have the AFM mounts and dont overtighten the mounting bolts or unplug the valves during transfer or you will pop a code
Now if you just made a TYPO and have a C6 and not a C7 , all you have to do is remove the fuse and cap off the vacuum lines
If you have a C7 I would not go with the bullets, stick with the NPP and go with the catless Borla x pipe , a mild to wild switch and a range device to keep the LT I in 8 cylinder mode . I guarentee u will love the sound and spend way less money
Dave
Last edited by Dcasole; Feb 16, 2019 at 08:08 AM.
Race Director
Joined: Dec 2013
Posts: 12,501
Likes: 3,627
Ditto, leave the NPP system in play.
If you want loud, then you can either pull the NPP fuse in the foot wheel, or install something like a mild to wild controller that does the same thing.
Hence fuse pulled so the NPP controller does not get electrical power to work, and the muffler gates stay open for the mufflers to be loud.
But when you need the mufflers to be quiet, then fuse/power back to the NPP so it closes the NPP gates isntead.
With the BB's, your loud all the time, and can even end up with drone.
Note, the NPP's open all the time will drone as well, but when you don't want the drone, you just allow the mufflers to go back into quiet mode.
If you are looking for loud all the time, but no drone, then either the Borla Atak (deeper muscle car pitch), or the Corsa extreme (higher pitch and more like a V10 sound).
If you want loud, then you can either pull the NPP fuse in the foot wheel, or install something like a mild to wild controller that does the same thing.
Hence fuse pulled so the NPP controller does not get electrical power to work, and the muffler gates stay open for the mufflers to be loud.
But when you need the mufflers to be quiet, then fuse/power back to the NPP so it closes the NPP gates isntead.
With the BB's, your loud all the time, and can even end up with drone.
Note, the NPP's open all the time will drone as well, but when you don't want the drone, you just allow the mufflers to go back into quiet mode.
If you are looking for loud all the time, but no drone, then either the Borla Atak (deeper muscle car pitch), or the Corsa extreme (higher pitch and more like a V10 sound).
Last edited by Dano523; Feb 16, 2019 at 02:51 PM.
Race Director
Joined: Apr 2010
Posts: 16,253
Likes: 1,657
From: Arizona
I pulled the fuse and it still wasn't good enough. I knew I loved the sound on my C5 FRC so I bought the same exhaust; B & B Bullets custom without mufflers.
I posted elsewhere that I do not notice much drone at all. And to me, it sounds the best.
Deep, aggressive, some in between shift snap, crackle, and pop, and sounds the way a Corvette 'should' sound.
Last edited by WICKEDFRC; Feb 17, 2019 at 01:01 AM.
