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Old 08-20-2013, 02:16 PM   #1
Deke736
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Functioning NPP for $50

After seeing several threads of people trying to hook up their NPP exhaust to a Camaro without that option, I felt that I should make a thread explaining a cheap and easy way to get a fully functioning NPP system without buying an expensive controller. The method I explain below even gives a little more control over the NPP since it will allow you to start the car with the valves closed, unlike the factory system.

Here is basically what we did on my buddy's SS (LS3) when he added the ZL1 exhaust:

We replaced the hard vacuum line shown in this pic behind the throttle body with flexible vacuum hose and a T-fitting. That is not my car in the pic- I just found it on the forum to show which line I was talking about.



NOTE: there are also other places to tap into vacuum, like the brake booster, but this is the route we chose for our install.

Here is a pic of the vacuum line replacing the hard line and the t-fitting.





Here are the connection points of the soft vacuum line replacing the hard line:





We then ran another section of vacuum line off the T-fitting along the fuel rail into the cabin through the hole in the firewall behind the brake fluid reservoir.

Here is a pic of the routing:







We ran the vacuum line in the cabin to a manual vacuum headlight switch from a C3 Corvette like this one:



I have found a source for these switches, so PM me for info.

Then we ran another section of vacuum line back out the same hole in the firewall and down under the car following the exhaust pipes all the way back (you will want to find a path away from the heat but following the exhaust route). When we got to the back, we used another T-fitting to split off the vacuum line to run to each of the fittings on the mufflers.

All said and done, we used probably 35 feet of vacuum line, and 2 T-fittings, and the Corvette vacuum switch. We zip tied the vacuum line where we could to secure it properly. If I remember correctly, we did have to use a larger diameter vacuum line to replace the hard line off the throttle body and used a T-fitting with a reducer built in. All pieces were bought from the local auto parts store except the switch, which I already had from restoring my Corvette. Total investment was around $50 (including buying a switch like the one in the link).

Total time to install was about an hour. I had the luxury of using a lift, so it made the job a little easier, but all of this could be done with the car on jack stands.

The switch is mounted under the dash and is completely out of view. The system works exactly like the stock ZL1 exhaust does, but without any electrical components.

I hope this helps. Let me know if you have any other questions.
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Old 08-22-2013, 07:49 AM   #2
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Thanks for posting. Great info.
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Old 08-28-2013, 01:21 PM   #3
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What size vacuum line and tee did you use?
Did you consider tapping off the unused port in back of the manifold? (assuming you have one)
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Old 08-28-2013, 01:31 PM   #4
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So of its run only by vacuum how much
Acceleration makes it open? A little or a lot. ? Seems like the factory limited opening at certain rpms for a reason.
I'm retrofitting soon and will have questions I'm sure.
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Old 08-28-2013, 02:40 PM   #5
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Quote:
Originally Posted by Southern Comfort View Post
What size vacuum line and tee did you use?
Did you consider tapping off the unused port in back of the manifold? (assuming you have one)
I believe it was 3/16" tubing to replace the hard line on the intake manifold, and 1/8" ID tubing for the run back to the mufflers. The T-fitting was a reducing fitting so we went from 3/16 to 1/8. This is the kit we picked up with assorted sized fittings.

http://m.autozone.com/autozone-mobil...25ry?id=365546

We did consider tapping the port on the back of the manifold, but I have big hands and my method was easier for me.

Quote:
Originally Posted by Jims73z View Post
So of its run only by vacuum how much
Acceleration makes it open? A little or a lot. ? Seems like the factory limited opening at certain rpms for a reason.
I'm retrofitting soon and will have questions I'm sure.
The butterfly valves open at more than 50% throttle, which is exactly like my ZL1. I believe they also open at over 3000 or 3500 RPM on the ZL1, but that also equates to increased throttle, so one could make the assumption that 50% throttle or the 3500 RPM threshold are the approximately the same.

I'll put it this way- if the valves are closed and you put your foot in the gas, they open up. When you take your foot off the gas, they close back up. If they are closed and you drive conservatively, they stay closed.

I hope this helps.
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Old 08-28-2013, 09:38 PM   #6
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And the switch cuts the vaccum so the butterflies are always open, correct?
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Old 08-29-2013, 07:12 AM   #7
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And the switch cuts the vaccum so the butterflies are always open, correct?
Yes, you can set it to always open as well. The switch allows total control of the butterfly valves.
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Old 08-29-2013, 09:39 PM   #8
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So we need to figure out how to open at idle like factory system other than no vacuum.
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Old 08-30-2013, 03:14 PM   #9
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So we need to figure out how to open at idle like factory system other than no vacuum.
Yes, if you don't just want to set the switch to open at idle.
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Old 08-30-2013, 07:09 PM   #10
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It looks like the corvette guys make their quiet mode louder using collars on the vacuum solenoid to hold them slightly open. Hopefully I'll get my npp installed soon.
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Old 09-11-2013, 09:03 PM   #11
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Ok. I got my mufflers and switch and will be installing soon.

Ill let you know how it goes.
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Old 09-12-2013, 05:21 PM   #12
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Installed
Sounds amazing.
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Old 09-12-2013, 06:53 PM   #13
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Installed
Sounds amazing.
Glad to hear this worked out for you!
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Old 09-12-2013, 07:06 PM   #14
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Thank you. Npp wild isn't too loud, sounds like a beast, snarling and popping. Great exhaust.
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Old 09-12-2013, 08:22 PM   #15
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How different is it in mild mode? Contemplating adding this control as well.
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Old 09-12-2013, 08:25 PM   #16
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I have the switch but haven't installed it yet. I'm thinking a project for tomorrow. Working on upload of video before and after I did today. Stay tuned.
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Old 09-12-2013, 11:47 PM   #17
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http://youtu.be/p_kgPK-ZmxI
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Old 10-09-2013, 07:10 PM   #18
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Hi, where do you by the npp mufflers ? also ca you just install a mild to wild to work them without the vacume ?
Any one try it with the factory ground effect kit ? they say it will not fit but it looks like it will . A cat back npp is close to 2k from what the dealer told me Thanks , Pete
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Old 10-10-2013, 09:57 AM   #19
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Quote:
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Hi, where do you by the npp mufflers ? also ca you just install a mild to wild to work them without the vacume ?
Any one try it with the factory ground effect kit ? they say it will not fit but it looks like it will . A cat back npp is close to 2k from what the dealer told me Thanks , Pete
PM 2SSRS@Gen5diy for the exhaust, or just keep an eye out in the used section. There's been a few of them for sale lately. I also don't think just a mild to wild switch will work. You'll need a vacuum system described above or will need to purchase the electronic kit that is available. It runs over $200. You should be able to find the axel back exhaust for around $400 or less. I've seen a few for a round $350.

I don't know about the factory GFX.
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Old 10-10-2013, 11:22 AM   #20
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I have the switch but haven't installed it yet. I'm thinking a project for tomorrow. Working on upload of video before and after I did today. Stay tuned.
I ordered the switch but they cancelled my order and refunded payment. Must be gonna be out of stock for the foreseeable future.
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Old 10-10-2013, 01:14 PM   #21
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Any worry on the hoses becoming loose or corroded due to weather, heat or other factors with time? I saw some other instructions on the Exhaust Commander NPP retrofit kit and they're running hoses down under as well. Not sure if that's the way it is on stock cars already equipped with NPP.
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Old 10-10-2013, 05:48 PM   #22
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Any worry on the hoses becoming loose or corroded due to weather, heat or other factors with time? I saw some other instructions on the Exhaust Commander NPP retrofit kit and they're running hoses down under as well. Not sure if that's the way it is on stock cars already equipped with NPP.
There's no clamps on the stock system, but if you were worried about it you could install them. I can't see why there would be any corrosion issues since it's just rubber vacuum hose pugged into an aluminum actuator. The stock system on my ZL1 looks fine after 1-1/2 years using the same method of attachment from the factory.
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Old 10-10-2013, 07:00 PM   #23
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Quote:
Originally Posted by Deke736 View Post
There's no clamps on the stock system, but if you were worried about it you could install them. I can't see why there would be any corrosion issues since it's just rubber vacuum hose pugged into an aluminum actuator. The stock system on my ZL1 looks fine after 1-1/2 years using the same method of attachment from the factory.
Cool was just checking.
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Old 10-12-2013, 05:56 PM   #24
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Thanks Deke76 I will email him. I have been looking and if I can find a cat back under a grand I will jump on it and also install the vacume line
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Old 10-30-2013, 11:16 PM   #25
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Is there a way to just buy the npp valves as to hook up this function on non OE mufflers?
Thanks!
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