Eliminate rasp

Antg146 · 03-07-2024, 09:08 AM

Recently installed 2 inch headers on my Camaro ss. I noticed if you aren’t flooring it 24/7, the car sounds really raspy and has no deep tone. Almost like a straight piped v6. My current setup is catless with a muffler delete and stock x pipe. What can be done to make the car deeper in tone or at least make it sound good? I have the stock npp muffler. Was considering on putting it back on to see if it would change the sound, what do you guys think?

KingLT1 · 03-07-2024, 09:32 AM

Put the muffler back on it.

WhiteMale · 03-07-2024, 09:43 AM

The usual answer for a car with headers is to put the suitcase back in, go back stock muffler, etc, not sure if you have/had NPP.

arpad_m · 03-07-2024, 11:26 AM

With those big headers, even the stock muffler won't be enough to fully eliminate the rasp, add resonators to the midsection as well.

Antg146 · 03-07-2024, 11:40 AM

Quote:

Originally Posted by arpad_m

With those big headers, even the stock muffler won't be enough to fully eliminate the rasp, add resonators to the midsection as well.

What resonators do you have?

arpad_m · 03-07-2024, 01:57 PM

Quote:

Originally Posted by Antg146

What resonators do you have?

https://www.magnaflow.com/products/1...-muffler-12469

...but I haven't gotten round to installing it yet

Others here did and reported ample rasp reduction, and I'll report back once mine is on the car, too.

The stock suitcase muffler does take some of the edge off, but at WOT you'll still hear a lot of it.

pbSS · 03-07-2024, 02:19 PM

Any combination of cats/mufflers/resonators will help. I personally have added Vibrant Performance (bottle style) resonators on my setup with catless ARH and Corsa NPP. They were a tight fit, but the local shop welded them on a custom xpipe they did to connect between the ARH and Axleback.

MyNameIs · 03-09-2024, 11:37 PM

Quote:

Originally Posted by Antg146

Recently installed 2 inch headers on my Camaro ss. I noticed if you aren’t flooring it 24/7, the car sounds really raspy and has no deep tone. Almost like a straight piped v6. My current setup is catless with a muffler delete and stock x pipe. What can be done to make the car deeper in tone or at least make it sound good? I have the stock npp muffler. Was considering on putting it back on to see if it would change the sound, what do you guys think?

An aged original muffler.

AZIROC · 03-11-2024, 01:27 PM

Wait... so basically it's just a straight pipe? Well that's why it sounds like dog shit and is the equivalent to the fart cans imports have. *and sound just as bad*

Leave that shit to the Dodge boys and get a decent sounding muffler. OEM is actually pretty decent with headers/no cats. Borla is solid as well.

Katech_Mike · 03-11-2024, 02:03 PM

The best answer in my opinion is to put cats back on it.

CalgaryZL1 · 03-11-2024, 03:12 PM

Quote:

Originally Posted by Katech_Mike

The best answer in my opinion is to put cats back on it.

Yup, unless you’re trying to achieve 1200 hp

FlukeSS · 03-11-2024, 03:15 PM

I'll say it then.

2" LT headers, no cats, 3" X-pipe (stock is 2.75), stock axle-back

Added MBRP axle-back + Cam

No you won't chop like I do, but MBRP will lower the tone.

All the rasp is mostly in the Axle-back maybe a small part of it in the x-pipe.

With my setup its basically straight piped. And it is loud compared to stock suit case.

Sound at near WOT again remember I have a cam. Also remember soon as you dump the stock suit case you are likely to get some drone. My car does have drone, more of a buzzing sound at cruising speeds. Some people hate it, it doesn't bother me anymore, it did at first until I got used to it. That said I attribute the buzzing sound to the cam, and trans tune that I have. The axle-back makes it more obvious than it would with the stock suit case still on.

CalgaryZL1 · 03-11-2024, 04:39 PM

It’s like putting grease on an eraser just so it doesn’t squeak anymore.

Ventmaster · 03-11-2024, 07:29 PM

The Magnaflow is a good piece for the right price and Borla offers this at a much higher price for those who overshot the mark with their exhaust sound.
https://www.rpidesigns.com/shop/item...sonator-60608/
But you may find the stock NPP can is needed as well. Everyone is different in their idea of the best sound.

03-07-2024, 09:08 AM	#1
Antg146 Drives: 2023 Camaro SS Join Date: Jan 2024 Location: Spring, TX Posts: 18	Eliminate rasp Recently installed 2 inch headers on my Camaro ss. I noticed if you aren’t flooring it 24/7, the car sounds really raspy and has no deep tone. Almost like a straight piped v6. My current setup is catless with a muffler delete and stock x pipe. What can be done to make the car deeper in tone or at least make it sound good? I have the stock npp muffler. Was considering on putting it back on to see if it would change the sound, what do you guys think?

03-07-2024, 09:32 AM	#2
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	Put the muffler back on it. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

03-07-2024, 11:26 AM	#4
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 11,616 View My Garage	With those big headers, even the stock muffler won't be enough to fully eliminate the rasp, add resonators to the midsection as well. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

03-11-2024, 03:15 PM	#12
FlukeSS Drives: 2020 Camaro 2SS A10 Join Date: Jun 2018 Location: Michigan Posts: 1,380	I'll say it then. 2" LT headers, no cats, 3" X-pipe (stock is 2.75), stock axle-back Added MBRP axle-back + Cam No you won't chop like I do, but MBRP will lower the tone. All the rasp is mostly in the Axle-back maybe a small part of it in the x-pipe. With my setup its basically straight piped. And it is loud compared to stock suit case. Sound at near WOT again remember I have a cam. Also remember soon as you dump the stock suit case you are likely to get some drone. My car does have drone, more of a buzzing sound at cruising speeds. Some people hate it, it doesn't bother me anymore, it did at first until I got used to it. That said I attribute the buzzing sound to the cam, and trans tune that I have. The axle-back makes it more obvious than it would with the stock suit case still on. __________________ 2020 Camaro 2SS A10 \| Rebuilt by: CBI Street Cars \| 2" SE LT Headers \| 3" SE X-Pipe \| 3" MBRP Axle-Back \| Pri & Sec Cat Deletes \| K&N Typhoon CAI \| LT2 Ported \| 95mm ZR1 TB \| DOD Delete \| BTR Stage I Cam \| ECM, TCM & E85 \|Tuned by: Shane Hinds \| Dyno: 510 rwhp 472 rwtq Last edited by FlukeSS; 03-11-2024 at 03:26 PM.

03-07-2024, 09:43 AM	#3
WhiteMale Drives: 23 ZL1 A10 Rapid Blue Join Date: Aug 2020 Location: MO Posts: 1,992	The usual answer for a car with headers is to put the suitcase back in, go back stock muffler, etc, not sure if you have/had NPP.

03-07-2024, 02:19 PM	#7
pbSS Drives: 2023 2SS 1LE Join Date: Dec 2022 Location: Anaheim, CA Posts: 15	Any combination of cats/mufflers/resonators will help. I personally have added Vibrant Performance (bottle style) resonators on my setup with catless ARH and Corsa NPP. They were a tight fit, but the local shop welded them on a custom xpipe they did to connect between the ARH and Axleback.

03-11-2024, 01:27 PM	#9
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 734	Wait... so basically it's just a straight pipe? Well that's why it sounds like dog shit and is the equivalent to the fart cans imports have. and sound just as bad Leave that shit to the Dodge boys and get a decent sounding muffler. OEM is actually pretty decent with headers/no cats. Borla is solid as well.

03-11-2024, 02:03 PM	#10
Katech_Mike Drives: 2015 Camaro ZL1 Join Date: Oct 2020 Location: Clinton Twp, Michigan Posts: 249	The best answer in my opinion is to put cats back on it.

03-11-2024, 04:39 PM	#13
CalgaryZL1 Drives: 2020 Chevy Camaro ZL1 Join Date: Apr 2023 Location: Calgary Canada Posts: 1,482	It’s like putting grease on an eraser just so it doesn’t squeak anymore.

03-11-2024, 07:29 PM	#14
Ventmaster Drives: 2017 1SS 6spd Join Date: Jan 2011 Location: Utah Posts: 2,869	The Magnaflow is a good piece for the right price and Borla offers this at a much higher price for those who overshot the mark with their exhaust sound. https://www.rpidesigns.com/shop/item...sonator-60608/ But you may find the stock NPP can is needed as well. Everyone is different in their idea of the best sound.

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