NPP (Dual Mode Exhaust) on a V2...
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Thread: NPP (Dual Mode Exhaust) on a V2...

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    NPP (Dual Mode Exhaust) on a V2...

    So this might ruffle some feathers, but the thing I seriously miss the most about my Corvettes was the NPP exhaust. Quiet when I want, Loud when I want because I had it hooked to a radioshack switch lol. My car was straight piped when I bought it which is extremely annoying for me because I leave the house early, get home late, and it rattles the neighbors windows when i fire it up inside my garage. I can't imagine how bad it will be once I put 2" Longtubes on it.

    So... I've been doing some looking around and I love Vadder's quad tips anyways so i'll be starting a project at the beginning of the year involving Gen5 ZL1 mufflers and the NPP in a box kit for Corvettes. It can be programmed to run off the Homelink buttons so you can select loud or quiet whenever. From looking at a LOT of pictures and doing some measuring on my friends stock ZL1 exhaust and it looks like the biggest issue is the angle that the tips come off the muffler itself and the length of pipe between the can and the bumper. I'll attach a pic and you can see they exit the can fairly straight and then bend when going to the bumper. I figure a little cutting, a lot of measuring, and a little welding I should be able to get them in their without much of a hassle. The biggest concern is fitting the cans, having the tips look like they should from the factory, and having the piping and cans not touch the "spare tire" well.

    Input?



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    In for updates!

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    Quote Originally Posted by acblack View Post
    In for updates!

    Sent from my Nexus 6P using Tapatalk
    It'll be a month or so before I get started on it.

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    In for updates. Loking to get exhaust by spring. c63 spoiled me with its LOUD stock bark.

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    Well its good to see there is interest in this haha. I totally thought I was going to get flamed over quad tips and wanting to make my car quieter.

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    Sorry for my ignorance but how is this different from cutouts? Reason I ask is I wanted to add cutouts but hear nothing but bad reviews on their reliability. I'm obviously not worried about quiet. Lol
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    Quote Originally Posted by Fyrdriver View Post
    Sorry for my ignorance but how is this different from cutouts? Reason I ask is I wanted to add cutouts but hear nothing but bad reviews on their reliability. I'm obviously not worried about quiet. Lol
    In some cases not much. It really depends on what the two different paths thru the muffler do. Some of them ARE just a full bypass so not really different than cutouts. Others do have subtle differences.

    From an actuation standpoint - cutouts are either open or shut. Most of these dual mode systems have some kind of programming that varies the amount of bypass automatically.
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    Quote Originally Posted by TheTinMan View Post
    So this might ruffle some feathers, but the thing I seriously miss the most about my Corvettes was the NPP exhaust. Quiet when I want, Loud when I want because I had it hooked to a radioshack switch lol. My car was straight piped when I bought it which is extremely annoying for me because I leave the house early, get home late, and it rattles the neighbors windows when i fire it up inside my garage. I can't imagine how bad it will be once I put 2" Longtubes on it.

    So... I've been doing some looking around and I love Vadder's quad tips anyways so i'll be starting a project at the beginning of the year involving Gen5 ZL1 mufflers and the NPP in a box kit for Corvettes. It can be programmed to run off the Homelink buttons so you can select loud or quiet whenever. From looking at a LOT of pictures and doing some measuring on my friends stock ZL1 exhaust and it looks like the biggest issue is the angle that the tips come off the muffler itself and the length of pipe between the can and the bumper. I'll attach a pic and you can see they exit the can fairly straight and then bend when going to the bumper. I figure a little cutting, a lot of measuring, and a little welding I should be able to get them in their without much of a hassle. The biggest concern is fitting the cans, having the tips look like they should from the factory, and having the piping and cans not touch the "spare tire" well.

    Input?


    Uhhh can someone explain to me where the hell this car is? balancing on..........what?

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    Quote Originally Posted by Fyrdriver View Post
    Sorry for my ignorance but how is this different from cutouts? Reason I ask is I wanted to add cutouts but hear nothing but bad reviews on their reliability. I'm obviously not worried about quiet. Lol
    Quote Originally Posted by TriTexan
    In some cases not much. It really depends on what the two different paths thru the muffler do. Some of them ARE just a full bypass so not really different than cutouts. Others do have subtle differences.

    From an actuation standpoint - cutouts are either open or shut. Most of these dual mode systems have some kind of programming that varies the amount of bypass automatically.
    What TriTexan said. Cut outs are either open or closed and this is essentially how it would be run on the CTS-V because it doesn't have the full module that the Camaro and Corvette have. Cut outs can be quite unreliable so hopefully I don't run into the same issues with the factory mufflers off a ZL1 and the NPP in a box kit. I've never seen anybody on the CorvetteForum having any issues with it. Here is a diagram showing how the muffler works. The red line is for the nonvalved tip. You see it comes into the muffler, goes completely around the muffler, then exits when the valve is closed because its the path of least resistance. When the valve is open the green line becomes effective and the exhaust gasses go into the muffler and straight out the tip. The straight through pipe is perforated in the older "Bi-mode" exhaust from the early Z06, i'm sure its the same way on the newer cars too for sound purposes, but Idk to what extent it is perforated on the ZL1. The last picture is of the Gen 6 Camaro.



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    Quote Originally Posted by thundergreybeard View Post
    Uhhh can someone explain to me where the hell this car is? balancing on..........what?
    I have no idea what its balanced on, but I want one because it would make working on the bottom of the car super easy haha.

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    Thanks for the explanation gentlemen. I'd love to see you get this working. What drives the actuators? Vacuum or 12v?
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    Quote Originally Posted by Fyrdriver View Post
    Thanks for the explanation gentlemen. I'd love to see you get this working. What drives the actuators? Vacuum or 12v?
    Vacuum drives the actuators. In a normal setup say on a Corvette like mine, with the fuse in the system the actuators are closed at startup, open at 2800rpm WOT, and open at 3500rpm under any throttle. The NPP in a box was designed for C6 Corvettes that didn't come factory with NPP. Essentially add the mufflers, add the kit, have NPP, but it doesn't have the functions above. Its just open or closed off a switch which is fine with me because I hardwired my C6 on a switch anyways. Quiet in the early mornings/late nights in my neighborhood and loud when cruising and playing. There really is no performance to be gained from doing this. Its just personal preference. I hate the fact that my car came with straight pipes because in all honesty its annoyingly loud at all times and It doesn't sound all that great. This should give a better tone and essentially cutouts.

    *edit*
    If you wanted the functions that come factory from a Corvette i'm sure you could always wire a Hobbs switch to open them under boost or a WOT switch as well. For me thats not really necessary as I don't care about that function which is why I bypassed it on my Corvettes. Also from my understanding vacuum keeps the valves closed, no vacuum means open. In theory you could skip the NPP in a box, run the vacuum from the engine to the exhaust and anytime you're in vacuum for 3-5 seconds the valves close, out of vacuum valves open.
    Last edited by TheTinMan; 12-08-2016 at 02:34 AM.

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    I was looking into this also. Maybe you will have more luck I got stymied because any muffs I could find were $500 a pair used plus I am not excited about screwing up my bumper cover.
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    This a great idea. Don't think you're ruffling anyone's feathers. Especially if your car is a DD. Please keep us posted.

    Always loved the way quad tips look as well, so I'm curious to see it on the V.
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    Is this car on a fucking rotisserie? OMG....
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    In for updates; keep up the good work and thanks for the pics.
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    The car is on stands that bolt in place of the wheels and use a hoist type system to roll the car on it's side. We have 2 that we use for shows. Pretty cool but I wouldn't be willing to work on a car that's set up on one, it's not quite that stable. I can't post a picture since I'm new but just google image search BMR PRI and you'll see a bunch of pictures of our setup.

    As far as the exhaust, I really wish they had this option from the factory. The new 6th gen Camaro sounds great with the exhaust open. I'm definitely interested in seeing what you come up with.

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    I'll keep people updated. I'll probably order the stuff on the first and start cutting.

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    in for updates

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    Might be a lot easier to make C7/sixth gen stuff work. I'm working on a controller that can activate the valves on those applications (they're electronic and not vacuum actuated).
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    Quote Originally Posted by DSteck View Post
    Might be a lot easier to make C7/sixth gen stuff work. I'm working on a controller that can activate the valves on those applications (they're electronic and not vacuum actuated).
    The sixth gen Camaro is a no go as its one very large muffler that spans the entire rear of the car as seen below.


    As for the C7 exhaust I haven't looked much into it, however the cans are substantially larger than that of the ZL1 and also a LOT more pricey. ($500 for one side C7 NPP vs $500 for a complete NPP ZL1 exhaust). Either would require about the same amount of work, the piping on the ZL1 mufflers needs changed vs the entire can on the C7 would have to be cut down to fit and the tips would have to be angled.


    As much as I would love to have the newer actuators, the ZL1 is still the easier and cheaper option. The cans, a little cutting and welding, and the NPP in a box kits for the C6 Corvette and you're all set. The NPP in a box comes with the "Mild to wild" controller as well, but it can also be hooked to the homelink switches in the V2.

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    I'm referring to just the valves. The V bumper isn't really intended for dual tip unfortunately.
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    Quote Originally Posted by DSteck View Post
    I'm referring to just the valves. The V bumper isn't really intended for dual tip unfortunately.
    Just replacing the vacuum actuators with electronic ones i'll have to look into. I'll be cutting the bumper on my V for the quad tips.

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    i saw this cts in the dealer, someone has done it already but in a v6 that plastic part looks like it's from GM
    Attached Thumbnails Attached Thumbnails NPP (Dual Mode Exhaust) on a V2...-image2-4-.jpg NPP (Dual Mode Exhaust) on a V2...-image1-2-.jpg
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    In for the tips but not just the tips.
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    I love the dual-mode exhaust on my car. Stays in tour mode on my street, but when I'm off and driving around I'm in sport mode. It's wet out otherwise I'd get you pics.

    It does have two separate mufflers, and they are actuated on 12v. They may work with the V depending on their size and shape.

    Oh, also they for sure would not be cheap, I don't think the Holden variants got a dual-mode from factory.
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    Vadder also has dual tips on his V which is what made me want dual tips on mine to be honest.


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