NPP w/Cam & Headers Too Loud - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

ST1LE · 10-12-2014, 09:03 AM

So I recently got my cam installed and I love the sound and volume, but I live downtown and its a bit much for a daily driver. Its very tolerable in the cabin, but I know it is really loud outside the car.

In an attempt to cut down the volume a little, I installed the Magnaflow Resonated X-Pipe. That did cut the volume down very well, but it surprisingly added ear bleeding drone. I had a GMC Sierra with Flowmaster Super 44's, and the drone when AFM kicked in was childs play compared to the drone this thing added.

Do I have any options other than completely switching catbacks? Any catbacks out there that are a little more quiet, but still a nice deep rumble with no drone like the NPP?

AbsolutHank · 10-12-2014, 09:09 AM

I'm assuming you have the NPP open all the time?

ST1LE · 10-12-2014, 09:21 AM

Quote:

Originally Posted by AbsolutHank

I'm assuming you have the NPP open all the time?

No I do not, I have installed a 3-way switch which allows me to open and close the flaps manually. With the flaps closed it is a little raspy for my liking though.

AbsolutHank · 10-12-2014, 09:30 AM

Interesting. Cats or not?

ST1LE · 10-12-2014, 09:35 AM

Cats

Firefighter · 10-12-2014, 09:37 AM

Do you have headers? If so do you have catalytic converters? They will reduce sound and drone.

I have NPP with cats and LT'S with out the MagnaFlow resonated X it was ridiculous sounding without the X. I wonder why the cam made such a difference.

Sent from my SM-G900V using Tapatalk

ST1LE · 10-12-2014, 10:01 AM

Yes LT and High Flows. The cam really added volume, as was expected. It was loud with just the headers as you said, but with the cam its nuts. When this is my weekend car, I wont mind but need a solution in the meantime.

I was shocked the resonated x-pipe added SO much drone, as its made to reduce drone. Oh well....not sure I want to drop over $1K on a catback so might not be able to do anything about it.

Firefighter · 10-12-2014, 10:06 AM

The tune might be able to be adjusted to minimize the drone. There is also the possibility of adding in some small resonators down stream a little bit. I know it's getting to be counter the whole plan but it might be an option...

Sent from my SM-G900V using Tapatalk

dklowrider · 10-12-2014, 05:43 PM

My Corsa is nice during normal driving but it's a screaming jesus at wot. There is no drone though so I'm afraid to touch it.

Sapper12b · 10-12-2014, 05:47 PM

ST1LE, if you want to meet up I can follow you around town and let you know if its too loud of a system or not. I'll give you my professional opinion

bkscott · 10-12-2014, 09:13 PM

J Pipes.

Camaro Dude · 10-13-2014, 12:24 AM

Quote:

Originally Posted by ST1LE

Yes LT and High Flows. The cam really added volume, as was expected........

I was shocked the resonated x-pipe added SO much drone, as its made to reduce drone. Oh well....not sure I want to drop over $1K on a catback so might not be able to do anything about it.

I've used the Magna Resonated X in other an other euro V8 application, and the Resonated X served it's mission well. Too tighten up the cylinder banks exhaust note in unison, reduce rasp, and drone as well.

Interestingly enough, my gut feeling always told me that the stock H pipe would work best on this LS3 V8, so I'm not entirely surprised by the final outcome here regarding drone notes.

Where I am quite surprised in all this, (as I'm sure many others are as well after reading your complaint), is the mega huge increase the cam brought on, even with your NPP flaps on permanent closed position!

Before you did the cam, how would you have had described the dB and sound with flaps closed, LT, and high flow cats in place? Too quiet, quiet, just right, a tad too loud?

In my case, with LT headers, no cats, CAI, but no cam, with flaps always closed, I'd describe it as hands down waaaaaay too quiet!

How a cam would increase it to a dB level that was unacceptable with flaps still closed is beyond me, and truly your best bet is to have the friend gent of yours who volunteered to follow you around and offer his 2 cents

.

Camero5 · 10-13-2014, 05:54 AM

ZL1 - NPP, NO CAT, CAM, Magnaflow X, Headers = No drone, perfect sound to me while flaps open but very quiet when closed.

I went with X for the same reasons. I live in an apt and it was extremely loud. Sometimes wish I left it as is but trying to be courteous.

ADM PERFORMANCE · 10-13-2014, 06:01 AM

Quote:

Originally Posted by Camero5

ZL1 - NPP, CAM, Magnaflow X, Headers = No drone, perfect sound to me while flaps open but very quiet when closed.

I went with X for the same reasons. I live in an apt and it was extremely loud. Sometimes wish I left it as is but trying to be courteous.

That's how we roll....😁

10-12-2014, 09:03 AM	#1
ST1LE Drives: E92 BMW M3 Join Date: Oct 2012 Location: Houston Posts: 4,496	NPP w/Cam & Headers Too Loud So I recently got my cam installed and I love the sound and volume, but I live downtown and its a bit much for a daily driver. Its very tolerable in the cabin, but I know it is really loud outside the car. In an attempt to cut down the volume a little, I installed the Magnaflow Resonated X-Pipe. That did cut the volume down very well, but it surprisingly added ear bleeding drone. I had a GMC Sierra with Flowmaster Super 44's, and the drone when AFM kicked in was childs play compared to the drone this thing added. Do I have any options other than completely switching catbacks? Any catbacks out there that are a little more quiet, but still a nice deep rumble with no drone like the NPP? __________________ SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs. J-Rod Built and Matt@FSP Tuned

10-12-2014, 09:09 AM	#2
AbsolutHank Drives: 2016 Corvette Z06 M6 Join Date: May 2009 Location: Odenton, MD Posts: 874	I'm assuming you have the NPP open all the time? __________________ 2013 Dodge Viper #44/150 Launch Edition IG:@absoluthank *20/21 BC Forged Wheels : BC Coilovers: TA Aero*

10-12-2014, 09:30 AM	#4
AbsolutHank Drives: 2016 Corvette Z06 M6 Join Date: May 2009 Location: Odenton, MD Posts: 874	Interesting. Cats or not? __________________ 2013 Dodge Viper #44/150 Launch Edition IG:@absoluthank *20/21 BC Forged Wheels : BC Coilovers: TA Aero*

10-12-2014, 09:35 AM	#5
ST1LE Drives: E92 BMW M3 Join Date: Oct 2012 Location: Houston Posts: 4,496	Cats __________________ SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs. J-Rod Built and Matt@FSP Tuned

10-12-2014, 09:37 AM	#6
Firefighter Drives: Black '13 2SS/RS/1LE w/NPP/NAV Join Date: Oct 2012 Location: Tampa by way of Miami... Posts: 4,934	Do you have headers? If so do you have catalytic converters? They will reduce sound and drone. I have NPP with cats and LT'S with out the MagnaFlow resonated X it was ridiculous sounding without the X. I wonder why the cam made such a difference. Sent from my SM-G900V using Tapatalk __________________ My Build Thread... http://www.camaro5.com/forums/showthread.php?t=285054

10-12-2014, 10:01 AM	#7
ST1LE Drives: E92 BMW M3 Join Date: Oct 2012 Location: Houston Posts: 4,496	Yes LT and High Flows. The cam really added volume, as was expected. It was loud with just the headers as you said, but with the cam its nuts. When this is my weekend car, I wont mind but need a solution in the meantime. I was shocked the resonated x-pipe added SO much drone, as its made to reduce drone. Oh well....not sure I want to drop over $1K on a catback so might not be able to do anything about it. __________________ SOLD - 2013 1LE - Pat G Spec'd Cam, NPP with 1 7/8" Long Tube Headers with High Flow Cats, Intake w/scoop, Ported Throttle Body, and Apex 1.25" Lowering Springs. J-Rod Built and Matt@FSP Tuned

10-12-2014, 10:06 AM	#8
Firefighter Drives: Black '13 2SS/RS/1LE w/NPP/NAV Join Date: Oct 2012 Location: Tampa by way of Miami... Posts: 4,934	The tune might be able to be adjusted to minimize the drone. There is also the possibility of adding in some small resonators down stream a little bit. I know it's getting to be counter the whole plan but it might be an option... Sent from my SM-G900V using Tapatalk __________________ My Build Thread... http://www.camaro5.com/forums/showthread.php?t=285054

10-12-2014, 05:43 PM	#9
dklowrider Drives: 2012 1SS, 6spd. many mods 478 rwhp Join Date: Apr 2014 Location: Harrisburg Pa. Posts: 283	My Corsa is nice during normal driving but it's a screaming jesus at wot. There is no drone though so I'm afraid to touch it.

10-12-2014, 05:47 PM	#10
Sapper12b HTCC Member Drives: 2013 Camaro SS Join Date: Dec 2012 Location: Houston, Texas Posts: 1,868 View My Garage	ST1LE, if you want to meet up I can follow you around town and let you know if its too loud of a system or not. I'll give you my professional opinion __________________

10-12-2014, 09:13 PM	#11
bkscott Drives: 2010 Camaro 2SS/RS Join Date: Dec 2009 Location: Grand Prairie, Texas Posts: 1,608 View My Garage	J Pipes. __________________ 94 Firebird Formula (Drowned 08/30/05) 2010 IBM 2SS/RS 6M Arrived 3/25/10. ADM CAI, Borla Type S Cat Back, VMAX Ported TB, LG Short Throw Shifter, 1LE Shocks, Hotchkis Sway Bars, Whiteline Cradle Bushing Inserts, Custom Powdercoated ZL1's ,Michelin Pilot Supersports, Stainless Power Headers, Solo J Pipes, AAC LED Sidemarkers, ZL1 Rockers, SLP Splitter, ADM Stage II Cam,ZL1 Diffuser,Vitesse Throttle Controller.

10-13-2014, 05:54 AM	#13
Camero5 Hide! My wife's coming! Drives: 2013 Chevrolet Camaro ZL1 Join Date: Jun 2011 Location: Las Colinas, TX Posts: 1,442 View My Garage	NPP w/Cam & Headers Too Loud ZL1 - NPP, NO CAT, CAM, Magnaflow X, Headers = No drone, perfect sound to me while flaps open but very quiet when closed. I went with X for the same reasons. I live in an apt and it was extremely loud. Sometimes wish I left it as is but trying to be courteous. __________________ 2013 Camaro ZL1 Convertible CRT - 630 RWHP / 620 RWTQ - ADM Performance Built/Tuned - ZL-700 Package - LS9 CAM - Lingenfelter CNC Ported Heads - Stainless Power Headers Last edited by Camero5; 10-13-2014 at 06:40 AM.