Do people actually like the NPP sound? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

AbsolutHank · 12-29-2013, 07:39 PM

I can appreciate the fact that it quiets down to the same sound level as any other stock car on the planet, but with the flaps open (fuse pulled on mine), it just sounds like shit. It sounds dirty, cluttered, and even raspy at times. It certainly doesn't sound like a proper aftermarket catback would on any other car.

I'm trying to figure out the right path to take on my car to help straighten out the sound. I've got all the main pulley/porting/injectors/LS9/intake/tune mods, but want to either do headers or stick with stock manifolds and add HF cats in the spring. I'm not trying to get any louder per se, but I want the sound quality to improve dramatically.

Maybe just do HF cats behind stock manifolds, X pipe and catback?

cam99 · 12-29-2013, 07:50 PM

I'm with you. I really don't care for the stock exhaust sound at all. Removed the cats and kept all the rest stock and it makes it sound like total hammered shit with the flaps open IMHO. I ended up wiring the flaps shut just so I could stand it.

MichaelH · 12-29-2013, 08:00 PM

Idk I personally think it sounds great

AbsolutHank · 12-29-2013, 08:04 PM

Quote:

Originally Posted by MichaelH

Idk I personally think it sounds great

It sounds ok from the drivers seat - I can admit that. Have you ever heard it outside the car? Following behind it down the road?

BPG · 12-29-2013, 08:14 PM

I'm with you. The more I hear it, the less I like it. The popping and rasp are getting old. Get a video of which route you ultimately go with...

white1LE · 12-29-2013, 08:31 PM

Bingo!! I rarely got on my 13 SC 1LE with Dynatech headers and HF cats because I was embarrassed of the sound. Idle and part throttle was great, but anything beyond that I wanted to sink into the seat and hide. I had an 05 GTO with headers, HF cats, LS3 top end, stock mid pipe and Kooks afterburners, that sounded amazing. If the Z sounds the same with Pfadt headers I'll slit my own wrist cause I'll be devastated. I hear Pfadt are supposed to help the sound so I'm crossing my fingers.

Blueclyde · 12-29-2013, 08:38 PM

I think the sound is fine. It's quiet when you want it to be quiet and loud when you get into if. I had a highly modified NA 2SS. While I'll admit it sounded amazing compared to the Z, the problem was it was too loud. I found myself nervous to get on it because I was afraid every cop in the county would hear me.

I'm more concerned with actual performance. The stock exhaust sounds good enough for me.

AZ-ZL1 · 12-29-2013, 08:41 PM

American Racing Stainless headers with cats has an incredible sound IMHO.
I've had a ton of compliments. M2W quiets it down when needed...like when the wife
asks " Do you have the flaps open"? LOL, they're always open.

Stephen12ZL1 · 12-29-2013, 09:01 PM

agreed...with no cats and headers with flaps open it is just plain obnoxious. If the tone was more mellow and less raspy, it would be fine. I can close the flaps at WOT via the ADM exhaust controller but the factory NPP exhaust leaves much to be desired. My friend has a CTSv with headers, hi flow cats, and corsa exhaust and his sounds much better.

MichaelH · 12-29-2013, 09:14 PM

Quote:

Originally Posted by AbsolutHank

It sounds ok from the drivers seat - I can admit that. Have you ever heard it outside the car? Following behind it down the road?

Yea I have a fly by on my phone to hear the supercharger whine with my new Intake and it sounds really good. Even my buddies say it sounds great

MichaelH · 12-29-2013, 09:28 PM

Here's a crappy video blame the woman, doesn't know how to video lol, but it sounds good

http://m.youtube.com/watch?v=hoikaipCups

DJ-Silver 2SS · 12-29-2013, 09:57 PM

Quote:

Originally Posted by MichaelH

Here's a crappy video blame the woman, doesn't know how to video lol, but it sounds good

http://m.youtube.com/watch?v=hoikaipCups

sounds good to me. I asked the wife if mine sounded like that when I did a fly by, she answered with, kinda.... your supercharger makes more noise.

snapp32e · 12-29-2013, 10:00 PM

I modded to 640rwhp with engine work. Part of that was adding a set of Kooks and removing the cats. I think it sounds amazing. Flaps are open all the time. I've had people tell me they've followed me around town just to listen to it. Personally the popping, snapping and crackling coming out the back gives me wood.

MichaelH · 12-29-2013, 10:05 PM

Quote:

Originally Posted by DJ-Silver 2SS

sounds good to me. I asked the wife if mine sounded like that when I did a fly by, she answered with, kinda.... your supercharger makes more noise.

Lol, this was the day I went to store her for the winter and I wanted to see if my intake made a big difference outside the car. She said yes haha

12-29-2013, 07:39 PM	#1
AbsolutHank Drives: 2016 Corvette Z06 M6 Join Date: May 2009 Location: Odenton, MD Posts: 874	Do people actually like the NPP sound? I can appreciate the fact that it quiets down to the same sound level as any other stock car on the planet, but with the flaps open (fuse pulled on mine), it just sounds like shit. It sounds dirty, cluttered, and even raspy at times. It certainly doesn't sound like a proper aftermarket catback would on any other car. I'm trying to figure out the right path to take on my car to help straighten out the sound. I've got all the main pulley/porting/injectors/LS9/intake/tune mods, but want to either do headers or stick with stock manifolds and add HF cats in the spring. I'm not trying to get any louder per se, but I want the sound quality to improve dramatically. Maybe just do HF cats behind stock manifolds, X pipe and catback? __________________ 2013 Dodge Viper #44/150 Launch Edition IG:@absoluthank *20/21 BC Forged Wheels : BC Coilovers: TA Aero*

12-29-2013, 07:50 PM	#2
cam99 Drives: 2012 ZL1 Join Date: Dec 2011 Location: pittsburgh area Posts: 1,426	I'm with you. I really don't care for the stock exhaust sound at all. Removed the cats and kept all the rest stock and it makes it sound like total hammered shit with the flaps open IMHO. I ended up wiring the flaps shut just so I could stand it. __________________ 2012 CTF ZL1-stock 2012 ZL1 (sold) JRE 75rwhp kit catless ported lsa TB 11.04 @ 128.35 on hoosier drs and skinnies @ PRP with 1100DA

12-29-2013, 08:00 PM	#3
MichaelH SOCAL HT5 Drives: 2013 BRM ZL1 M6 Join Date: Apr 2010 Location: NE Ohio Posts: 1,495 View My Garage	Idk I personally think it sounds great __________________ 2013 ZL1 M6 - Mods-in the works Old vehicles 2010 CGM Camaro (sold) Other Vehicles: 2008 Kawasaki ZX6R-115 RWHP in mid summer 2006 Chevy Trailblazer SS- For Sale; Lots of extras

12-29-2013, 08:14 PM	#5
BPG Faster than you... Drives: 1194whp. 8.62@168. daily driver... Join Date: Nov 2013 Location: USA Posts: 430	I'm with you. The more I hear it, the less I like it. The popping and rasp are getting old. Get a video of which route you ultimately go with... __________________ GTR

12-29-2013, 08:31 PM	#6
white1LE Drives: 2013 Camaro ZL1 Join Date: Nov 2012 Location: Dubuque, IA Posts: 880	Bingo!! I rarely got on my 13 SC 1LE with Dynatech headers and HF cats because I was embarrassed of the sound. Idle and part throttle was great, but anything beyond that I wanted to sink into the seat and hide. I had an 05 GTO with headers, HF cats, LS3 top end, stock mid pipe and Kooks afterburners, that sounded amazing. If the Z sounds the same with Pfadt headers I'll slit my own wrist cause I'll be devastated. I hear Pfadt are supposed to help the sound so I'm crossing my fingers. __________________ 13 ZL1 A6 LSX 427 with AGP Twin Turbos, E85 and Flex Fuel. Built and tuned by ADM Performance 1000rwhp

12-29-2013, 08:38 PM	#7
Blueclyde Drives: 2023 ZLE Join Date: Jun 2009 Location: Detroit Posts: 1,717	I think the sound is fine. It's quiet when you want it to be quiet and loud when you get into if. I had a highly modified NA 2SS. While I'll admit it sounded amazing compared to the Z, the problem was it was too loud. I found myself nervous to get on it because I was afraid every cop in the county would hear me. I'm more concerned with actual performance. The stock exhaust sounds good enough for me.

12-29-2013, 08:41 PM	#8
AZ-ZL1 Dry Heat My @ss Drives: 2012 ZL1 SUMMIT WHITE Join Date: Mar 2012 Location: Chandler, Arizona Posts: 758	American Racing Stainless headers with cats has an incredible sound IMHO. I've had a ton of compliments. M2W quiets it down when needed...like when the wife asks " Do you have the flaps open"? LOL, they're always open. __________________ 2012 #1765: Xpel Clear Bra, 15% Tint, M2W, LPE GT9 Cam, Ported Heads & Snout, Upgraded Valve Train, 90mm TB, LPE Dual Fan HX, 2.55 Upper, 9.1 Lower (18%), Id850's, KB BAP, Roto-fab CAI, AR Stainless Headers, 673 rwhp, A6, Nothin but Fun!

12-29-2013, 09:01 PM	#9
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	agreed...with no cats and headers with flaps open it is just plain obnoxious. If the tone was more mellow and less raspy, it would be fine. I can close the flaps at WOT via the ADM exhaust controller but the factory NPP exhaust leaves much to be desired. My friend has a CTSv with headers, hi flow cats, and corsa exhaust and his sounds much better. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

12-29-2013, 09:28 PM	#11
MichaelH SOCAL HT5 Drives: 2013 BRM ZL1 M6 Join Date: Apr 2010 Location: NE Ohio Posts: 1,495 View My Garage	Here's a crappy video blame the woman, doesn't know how to video lol, but it sounds good http://m.youtube.com/watch?v=hoikaipCups __________________ 2013 ZL1 M6 - Mods-in the works Old vehicles 2010 CGM Camaro (sold) Other Vehicles: 2008 Kawasaki ZX6R-115 RWHP in mid summer 2006 Chevy Trailblazer SS- For Sale; Lots of extras

12-29-2013, 10:00 PM	#13
snapp32e Drives: '81-Z28/'07-Tundra/'12-ZL1/'13-Jeep Join Date: Oct 2011 Location: Canada Posts: 529	I modded to 640rwhp with engine work. Part of that was adding a set of Kooks and removing the cats. I think it sounds amazing. Flaps are open all the time. I've had people tell me they've followed me around town just to listen to it. Personally the popping, snapping and crackling coming out the back gives me wood. __________________ ZL1 #612