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What I've read here and elsewhere is that there's no way to keep the valves open all the time and there ii no way the well known Mild to Wild switch will work nor does removing a fuse ala C7 and earlier work either..
Assuming all the above is true and the fact :earlier Vets had four converters and the C8 only has two and also shorter exhaust pipe's is the NPP on C8's significantly louder ?
I like moderately LOUD, on my C7 I pulled the fuse at 300 miles and never put it back. What would be my options on a C8 ?
The C8 is louder from the outside but quieter inside the cabin. To keep the valves open as much as possible use Track or Z-Mode.
Or set it that way in My Mode so the car will start in that position. If left in Z- or Track modes, the mode will revert to Tour mode (i.e., mild exhaust) upon restart.
It's all just an opinion as I never tested with a sound meter, but I feel my C8 with NPP when left at the loudest exhaust setting is as loud (outside the cabin) as my C7. And I used Mild to Wild in my C7 with the valves open 100% of the time. Before my C8 finally arrived I was worried it would be too quiet per all of the posts on it and the fact that no one can get the Mild to Wild to work with it. However, now that I have my C8 I no longer feel that way with the exhaust set to the loudest setting using My mode and Z mode. Because of this, I have no intention of getting a Mild to Wild even if someone can get it to work. Again, just my opinion for what it is worth.
For comparison sake, IMO my C5 with Borla was the ideal sound, but there is no way I am going to spend 6 or 7 K on a C8 exhaust only to make noise ! I am tossing around the idea of getting the AWE street version for a touch under 3K and not bothering with the NPP option.
If you want the NPP valve open 100% of the time:
1) unplug the NPP wire from the NPP valve found in each outer tailpipe.
2) purchase two C8 NPP simulators.
3) plug the simulators into the wire from step one above.
The Corvette team says the C8 is the loudest exhaust they've offered on a base model Corvette since the federal sound standards went into effect. And from outside the car, I think that's true. It's just much harder to hear from inside, especially when the car is closed up. With the top and back window down on an HTC, it's not too bad inside the car. Pull in the paddles and goose it while going through an underpass or tunnel and you'll see.
Of course, no stock exhaust is going to be as loud as an aftermarket system. Those vendors are so concerned with being legal.
This is a good video where Tadge discusses engine and exhaust noise! As he has said previously, they found that a "Ferrari they dissected" had a 9 mm thick rear cabin window and they copied. It's >twice as thick as a windshield for one reason NOISE! As he notes the noisy part of the engine it right behind you so they insulated very well.
Perhaps someone will replace that window with the thickness of the side window. In another interview Tadge mentioned the routed the "good intake air sound" close to that window so you could hear it!! I put a pic of the passage!
As Tage described they wanted as much "Good Intake" sound to get into the cabin so they had it Pass closer to the side glass, which is thin compared to the 9 mm carbon glass! When I added a low restriction air filter checked the passage as Tadge described! Ran my flexible fiberoptic cable from the filter housing!
I emailed Paragon and asked if their simulators would work in this situation. They really didn't answer me, just saying that the simulators are used for aftermarket exhausts. Has anyone tried this?
I emailed Paragon and asked if their simulators would work in this situation. They really didn't answer me, just saying that the simulators are used for aftermarket exhausts. Has anyone tried this?
I haven't tried this but I understand the concept. The simulators keep the computer from throwing codes when the NPP valves are unplugged. The NPP valves should remain open when unplugged. You could try unplugging the valves to verify the valves remain open when unplugged. Hopefully, the codes would be cleared when the valves are plugged back in. You may want to do some testing to verify any increase in sound is worth the expense before committing to the simulators. There may not be much difference.
I emailed Paragon and asked if their simulators would work in this situation. They really didn't answer me, just saying that the simulators are used for aftermarket exhausts. Has anyone tried this?
cicio performance works.
you must call to order for the tail pipe simulators only.
yes they work.
i disconnected the battery, before any work.
no CEL.
yes, the valves will be open 100%.
Forum member GMAC1 did the modules as option to bypassing the valves. We were emailing back and forth as I too was looking for an easier and cheaper way to get a louder exhaust. From what I recall it didn't work in keeping the valves 100% open all the time. Maybe he will see this thread and post, or someone can reach out to him for more details.
I personally want it louder but with everything C8 either being expensive or risking warranty (exhaust, cats, etc are all next to engine and tranny) I'm just leaving it stock. My C7 Z06 had the fuse pulled and mid pipe. It was perfect in sound. Loud enough to hear and enjoy just under normal driving and with a slight stab of the throttle it would scare the driver next to you. With my C8 it's just to quiet unless I'm letting the rpms go up for no reason or driving reckless.
^^^
Agree the exhaust sound is louder in my C8 Coupe when outside and the interior is quiet. That is until they open and mine are set to Track so past about 2000 rpm they open. At WOT they are very loud even inside!
NPP usage
