Here we go.. Another NPP Exhaust One

Braden1 · 01-03-2019, 07:16 PM

Okay, here it goes. I have been looking around EVERYWHERE for a long time, and can't find the exact answers that I'm looking for. Just about ready to say screw it and start some trial and error. But that's going to start burning the wallet away slowly.

I have a factory 2016 2SS with factory dual mode exhaust. Yes, it sounds awesome, but it could be a tad louder. I'm looking for the following:

On Stealth mode: I kinda was hoping to have this sound like my current "Track Mode" sounds. Loud enough that it sounds like the car it is, but not so obnoxious that I have to hide from my neighbors every morning.

On Track/Sport mode: This is where I want the car to be absolutely ridiculous. Drone doesn't matter, because I can always throw it into stealth mode on the Highway or what not. But I want it loud. Do I run separate pipes around the resonators/cats? Is it possible?

I just want to know what others have done for this. Has anyone heard any brands/series of mufflers that sound fairly similar to the 'OPEN' factory NPP exhaust? I never us stealth mode now, but I'm sure I would if i had the set up done the way I wanted.

Greatly appreciate any feedback...

oldman · 01-03-2019, 08:17 PM

Nothing is going to be louder than qtp cutoffs. The second choice would be qtp mufflers...

Umbriel · 01-04-2019, 07:48 AM

Well when you are in track mode you are basically straight piped so it probably won't get much louder than that.

DWR · 01-04-2019, 08:10 AM

Quote:

Originally Posted by Umbriel

Well when you are in track mode you are basically straight piped so it probably won't get much louder than that.

I thought so too but it's apparently a good bit louder even when installed right in front of the muffler (especially noweeds diverters) according to a few users on here.

ecko04 · 01-04-2019, 08:19 AM

People love stating that track mode is ”basically” straight piped, no it's not. Not even close to it. I am convinced that the people who say that have never heard a straight piped LT1 or a muffler delete.

In track mode, the valves still close. Also in track mode, the sound partially passes through one of the muffler chambers thereby quieting it.

If you want loud with an option QTP cutouts with the wireless transmitter are a great choice. You can still use your drive mode selector as you usually would and open the cutouts fully or close them partially. It's a muffler delete on demand, sounds great and won't break the bank.

Sent from my iPhone using Tapatalk Pro

Umbriel · 01-04-2019, 08:45 AM

Quote:

Originally Posted by DWR

I thought so too but it's apparently a good bit louder even when installed right in front of the muffler (especially noweeds diverters) according to a few users on here.

Maybe because it is under the car and bouncing off of the ground? The valves in track mode still open and close when it is warmed up depending on how you are driving but I don't know he details about it. I personally don't like the NPP and bought an AWE cat back.

Umbriel · 01-04-2019, 08:48 AM

Quote:

Originally Posted by ecko04

People love stating that track mode is ”basically” straight piped, no it's not. Not even close to it. I am convinced that the people who say that have never heard a straight piped LT1 or a muffler delete.

In track mode, the valves still close. Also in track mode, the sound partially passes through one of the muffler chambers thereby quieting it.

If you want loud with an option QTP cutouts with the wireless transmitter are a great choice. You can still use your drive mode selector as you usually would and open the cutouts fully or close them partially. It's a muffler delete on demand, sounds great and won't break the bank.

Sent from my iPhone using Tapatalk Pro

I was referring to WOT when I referenced that.

crosive · 01-04-2019, 08:49 AM

there is a difference in sound between fuse-pulled track mode and muffler delete. if you think there isn't, you've not heard it.

Umbriel · 01-04-2019, 08:53 AM

Quote:

Originally Posted by crosive

there is a difference in sound between fuse-pulled track mode and muffler delete. if you think there isn't, you've not heard it.

I have heard it because I did it on mine and then put it back in the ext day because it sounded like shit. The valves do close some in track mode depending on driving conditions but on cold start up and WOT they are open and it sounds terrible.

crosive · 01-04-2019, 09:05 AM

Quote:

Originally Posted by Umbriel

I have heard it because I did it on mine and then put it back in the ext day because it sounded like shit. The valves do close some in track mode depending on driving conditions but on cold start up and WOT they are open and it sounds terrible.

not if you pull the fuse

Umbriel · 01-04-2019, 09:14 AM

Quote:

Originally Posted by crosive

not if you pull the fuse

I pulled it on mine and hated it so I put it back in. I also don't think the valves are fully open with the fuse pulled, it sounded more like maybe halfway or something to me. I could be wrong though like i said I only had it like that for a day.

crosive · 01-04-2019, 09:35 AM

Unless there is physically something wrong with yours, the springs force them open all the way when no power is present.

NeverDie · 01-04-2019, 09:44 AM

Quote:

Originally Posted by Umbriel

Well when you are in track mode you are basically straight piped so it probably won't get much louder than that.

It's true, you are basically straight piped at that point....

...except for the cats, secondary cats, resonator, mufflers, etc.

ALLGM6 · 01-04-2019, 09:45 AM

My Camaro doesn’t have NPP, so I bought an AWE Touring kit, which I haven’t installed, but based on videos, seems to be about like the NPP track mode from what I can tell.

More relavent to your question, I have a C7 Z51 with NPP. On my Vette, I put the Flowmaster Outlaw system, designed to work with NPP (it was expensive at 2k). But it achieves exactly what I think you’re looking for. Stealth mode is now close to factory track mode and track mode is a good bit louder than anything the stock NPP put out. It’s also a bit deeper of a tone. I think it’s great and love the system on my Vette. You might check to see what systems Flowmaster has for the Camaro NPP. Outlaw is their loudest system. American Thunder is more mellow.

01-03-2019, 07:16 PM	#1
Braden1 Drives: RED 2016 2SS M6 Join Date: Dec 2018 Location: British Columbia Posts: 11 View My Garage	Here we go.. Another NPP Exhaust One Okay, here it goes. I have been looking around EVERYWHERE for a long time, and can't find the exact answers that I'm looking for. Just about ready to say screw it and start some trial and error. But that's going to start burning the wallet away slowly. I have a factory 2016 2SS with factory dual mode exhaust. Yes, it sounds awesome, but it could be a tad louder. I'm looking for the following: On Stealth mode: I kinda was hoping to have this sound like my current "Track Mode" sounds. Loud enough that it sounds like the car it is, but not so obnoxious that I have to hide from my neighbors every morning. On Track/Sport mode: This is where I want the car to be absolutely ridiculous. Drone doesn't matter, because I can always throw it into stealth mode on the Highway or what not. But I want it loud. Do I run separate pipes around the resonators/cats? Is it possible? I just want to know what others have done for this. Has anyone heard any brands/series of mufflers that sound fairly similar to the 'OPEN' factory NPP exhaust? I never us stealth mode now, but I'm sure I would if i had the set up done the way I wanted. Greatly appreciate any feedback...

01-03-2019, 08:17 PM	#2
oldman Drives: SS 6 speed of course Join Date: Jan 2016 Location: Hilo, HI Posts: 4,324	Nothing is going to be louder than qtp cutoffs. The second choice would be qtp mufflers... __________________ Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.

01-04-2019, 07:48 AM	#3
Umbriel Drives: 2016 Camaro SS Join Date: Sep 2018 Location: Bartlett, TN Posts: 1,121	Well when you are in track mode you are basically straight piped so it probably won't get much louder than that.

01-04-2019, 08:19 AM	#5
ecko04 Drives: Too many to list Join Date: Dec 2011 Location: East Coast Runner Posts: 878	People love stating that track mode is ”basically” straight piped, no it's not. Not even close to it. I am convinced that the people who say that have never heard a straight piped LT1 or a muffler delete. In track mode, the valves still close. Also in track mode, the sound partially passes through one of the muffler chambers thereby quieting it. If you want loud with an option QTP cutouts with the wireless transmitter are a great choice. You can still use your drive mode selector as you usually would and open the cutouts fully or close them partially. It's a muffler delete on demand, sounds great and won't break the bank. Sent from my iPhone using Tapatalk Pro

01-04-2019, 08:49 AM	#8
crosive Drives: 18 zl1 Join Date: Aug 2017 Location: central alabama Posts: 935	there is a difference in sound between fuse-pulled track mode and muffler delete. if you think there isn't, you've not heard it.

01-04-2019, 09:35 AM	#12
crosive Drives: 18 zl1 Join Date: Aug 2017 Location: central alabama Posts: 935	Unless there is physically something wrong with yours, the springs force them open all the way when no power is present.

01-04-2019, 09:45 AM	#14
ALLGM6 Drives: 2018 Camaro ZL1 Join Date: Dec 2018 Location: Hollister, CA Posts: 18 View My Garage	My Camaro doesn’t have NPP, so I bought an AWE Touring kit, which I haven’t installed, but based on videos, seems to be about like the NPP track mode from what I can tell. More relavent to your question, I have a C7 Z51 with NPP. On my Vette, I put the Flowmaster Outlaw system, designed to work with NPP (it was expensive at 2k). But it achieves exactly what I think you’re looking for. Stealth mode is now close to factory track mode and track mode is a good bit louder than anything the stock NPP put out. It’s also a bit deeper of a tone. I think it’s great and love the system on my Vette. You might check to see what systems Flowmaster has for the Camaro NPP. Outlaw is their loudest system. American Thunder is more mellow.

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