like my stock exhaust... but headers and then some - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Keachj06 · 05-27-2015, 04:40 PM

Looking at getting a set of Cat-less LT's and keeping the rest of the system stock I have the dual mode *fuse pulled* exhaust and was wondering will I see any gains from changing the cats back from the stock exhaust or will it be insignificant in this case, also how will the sound be afterward I had LT's and a full 3" back to corsa extremes on my old LS2 vette and loved the sound, will I be close in or should I get another exhaust set up, I really don't want to ditch the stock one as I love the quad tip look on the back end.

Pluto · 05-27-2015, 04:56 PM

Quote:

Originally Posted by Keachj06

Looking at getting a set of Cat-less LT's and keeping the rest of the system stock I have the dual mode *fuse pulled* exhaust and was wondering will I see any gains from changing the cats back from the stock exhaust or will it be insignificant in this case, also how will the sound be afterward I had LT's and a full 3" back to corsa extremes on my old LS2 vette and loved the sound, will I be close in or should I get another exhaust set up, I really don't want to ditch the stock one as I love the quad tip look on the back end.

You won't see gains even if you did use an aftermarket exhaust. All the gains are made from the LTs and a tune. If you have the dual mode it'll sound really good and will perform just the same as the aftermarket. If you end up not liking the sound then you can look into a catback just don't expect anything other than a sound change.

Keachj06 · 05-27-2015, 05:02 PM

So I also noticed my outer tips are getting black where the inner ones are not so with the flap open is the exhaust only routed through the two outer tips thus making my exhaust a dual tip instead of all four being functional and if so would that have an effect on removing the by product from the headers back because of the increased back pressure? I understand back pressure is good but it also restricts HP and Flow overall especially if in the near future adding a forced inducted product like a supercharger.
thanks for the quick response.

Dynamite · 05-27-2015, 05:08 PM

Your NPP really isnt a "stock exhaust." It is an upgrade that is just as good as aftermarket. I have headers on with my NPP and am satisfied with it. I have the flaps open too.

Vertwheal · 05-27-2015, 05:16 PM

It will lose its deeper tone and turn more raspy and it will be insanely loud. No sense in getting anything else unless you want to change the sound as you wont see any gains from a catback.

Keachj06 · 05-27-2015, 05:20 PM

... I want that deep tone not the raspy one, damn, noticed you have LT's in CA... living dangerously I see. thanks for the insight.

GONIF · 05-27-2015, 05:55 PM

I would try it and see if you like it first .With the long tubes and HF cats and the Duel mode it sounds damn good .

dentnshell · 05-27-2015, 06:22 PM

Quote:

Originally Posted by Keachj06

So I also noticed my outer tips are getting black where the inner ones are not so with the flap open is the exhaust only routed through the two outer tips thus making my exhaust a dual tip instead of all four being functional and if so would that have an effect on removing the by product from the headers back because of the increased back pressure? I understand back pressure is good but it also restricts HP and Flow overall especially if in the near future adding a forced inducted product like a supercharger.
thanks for the quick response.

if you get down on the ground behind your exhaust with a flashlight you can manually operate the flap on your NPP.
There you can clearly see In "Wild" mode (fuse pulled) the exhaust is going straight through the muffler and out the outer tip. Kind of like straight pipe...

When the flap is closed "Mild" the exhaust is routed so that it uses the muffler and out the inner tip.

The difference in sound comes from the difference in how the exhaust exits.

Vertwheal · 05-27-2015, 08:24 PM

Quote:

Originally Posted by Keachj06

... I want that deep tone not the raspy one, damn, noticed you have LT's in CA... living dangerously I see. thanks for the insight.

Well I didn't buy the car so the state can tell me what to do with it. I'm hoping to be out of here before it's time to smog in 5 years.

05-27-2015, 04:40 PM	#1
Keachj06 Drives: 15 SS,13 Duc Panigale Join Date: Apr 2015 Location: Las Vegas,NV Posts: 133	like my stock exhaust... but headers and then some Looking at getting a set of Cat-less LT's and keeping the rest of the system stock I have the dual mode fuse pulled exhaust and was wondering will I see any gains from changing the cats back from the stock exhaust or will it be insignificant in this case, also how will the sound be afterward I had LT's and a full 3" back to corsa extremes on my old LS2 vette and loved the sound, will I be close in or should I get another exhaust set up, I really don't want to ditch the stock one as I love the quad tip look on the back end.

05-27-2015, 05:08 PM	#4
Dynamite Drives: 2013 Camaro 2SS/RS XD Join Date: May 2012 Location: Washington, D.C. Posts: 522	Your NPP really isnt a "stock exhaust." It is an upgrade that is just as good as aftermarket. I have headers on with my NPP and am satisfied with it. I have the flaps open too. __________________ 2013 Black 2SS Camaro - NPP Exhaust - Rotofab Cold Air Intake - SWorks Stainless Power Long Tube Headers 1 7/8" - CNC Ported Throttle Body - Showstopper Sidemarkers Ghosted Black - Sequential Tail Lights - RX Catch Can - Hill Start Assist Disabled- 35% Tint - Heritage Grille - BTR Stage 4 Cam - 3.91 Gears

05-27-2015, 05:16 PM	#5
Vertwheal Drives: 2015 AGM 1SS/RS/1LE NPP Join Date: Dec 2014 Location: California Posts: 242	It will lose its deeper tone and turn more raspy and it will be insanely loud. No sense in getting anything else unless you want to change the sound as you wont see any gains from a catback. __________________ 2015 AGM 1SS/1LE/RS - NPP (Fuse Out) - Nav - Rear Vision CAI intake, ADM scoop, Rotofab washer relocation, Bo White stage II ported TB, Stainless Power 1 7/8 LT, RPI Splash Guards, Black Gorilla Locking Lug Nuts, Tuned by Rick @ Synergy Motorsports - 414/403 on a Mustang dyno

05-27-2015, 05:55 PM	#7
GONIF Drives: 73 VETTE ,, 05 2500hd diesel,14 1LE Join Date: Feb 2014 Location: The Left lane PHOENIX AZ Posts: 2,626	I would try it and see if you like it first .With the long tubes and HF cats and the Duel mode it sounds damn good . __________________ OLD GUY FLYING FAST AND LOW

05-27-2015, 05:02 PM	#3
Keachj06 Drives: 15 SS,13 Duc Panigale Join Date: Apr 2015 Location: Las Vegas,NV Posts: 133	So I also noticed my outer tips are getting black where the inner ones are not so with the flap open is the exhaust only routed through the two outer tips thus making my exhaust a dual tip instead of all four being functional and if so would that have an effect on removing the by product from the headers back because of the increased back pressure? I understand back pressure is good but it also restricts HP and Flow overall especially if in the near future adding a forced inducted product like a supercharger. thanks for the quick response.

05-27-2015, 05:20 PM	#6
Keachj06 Drives: 15 SS,13 Duc Panigale Join Date: Apr 2015 Location: Las Vegas,NV Posts: 133	... I want that deep tone not the raspy one, damn, noticed you have LT's in CA... living dangerously I see. thanks for the insight.