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02-04-2023, 12:13 PM
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#1 |
 Drives: 2017 2SS, 2000 gmc sonoma turbo Join Date: Feb 2021
Location: Kentucky
Posts: 23
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How to quiet down 2020 1ss with full header back system
Well, my brother just bought a 2020 1ss camaro without checking to see why it was so loud, i looked under the hood and it has a full catless header back system. From factory this car came with npp exhaust by looking at the rpo codes so i guess i have a few questions
1: does anyone know where to find the factory npp muffler system for sale 2: would the factory muffler be able to hide at least some of the droning noise on the car when driving interstate speeds 3: are there any better options for quieting it down? we want to keep the headers but it is his daily driver and the loud exhaust may get annoying over time 4: does anyone have any good sound clips of a 6th gen camaro with headers and stock npp exhaust? mainly looking to see if stealth mode will be managable as a daily driver thanks! |
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02-04-2023, 06:01 PM
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#2 |
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Having FUN in the SUN...
Drives: 2022 M6 ZL1 1LE Join Date: Jan 2022
Location: San Diego CA
Posts: 1,048
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For starters... I suggest you find a used stock exhaust set up and take the car to a muffler shop to have it installed. I'd drive that for a while first, and if that is still too loud, would consider putting a set of green cats on the car.
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2022 M6 ZLE: Katech CNC Ported Blower + Ported Heads + 103mm TB + Oil Pump + C5R Chain + Valve Covers + Coil Relocation
TSP VVT and DoD Delete Covers + LME Chain Guide + DSX Billet Lid + ATI Damper + 9.17" Lower + 2.4" Upper + MM Wild CC Coated ARH + AWE Touring + Magnaflow Center X + E85 + MSD Coils + Banks iDash + JMS Booster + Synergy Fender Tank ALL the RED Rear End BMR Goodies + JRE Terminator Cam Package + Remote Tuning and Moral Support from TED @ JRE BMR Motor Mounts + DMS Front HX + FIC 30's + APEX SM.10's + 305/345 R888R's = 770rwhp 785rwtq @E50 13.5psi |
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02-04-2023, 07:51 PM
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#3 |
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Shadow Gray '19 ZLE M6
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Yeah your brother can look for a stock axleback, add cats and add a resonator in place of the x-pipe. He can do those one at a time (in that order) and stop when he's happy with the sound
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2019 ZL1 1LE | M6 | SGM | PDR | CF Dash | Nav | Wheel Locks
PPF | Paint Correction | ZL1 Addons Rock Guards | ZL1 Addons Lift Pads | ZL1 Addons Feather Lite Tow Hook | JWM Smoked Sidemarkers | Wildhammer Smoked Rear Reflectors | JWM License Plate LEDs | RotoFab CAI | ADM IC Reservoir v2 | BC Forged RZ05 | SPL Toe Arms | BW Brake Deflectors | CMS Roll Bar | Schroth Profi II ASM Harnesses . Sold: '99 Trans Am (bolt-ons & cam) | '00 WS6 (bolt-ons, heads, cam, 12 bolt) | '05 CTS-V (bolt-ons, short throw) | '10 SS/RS M6 (short throw, CAI, coilovers, LTs, catback, JRE tune) | '01 WS6 YouTube |
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02-04-2023, 08:09 PM
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#4 | |
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Account Suspended
Drives: 17' Chevy Kamaro SS 6 speed Join Date: Mar 2022
Location: US
Posts: 337
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Quote:
Add a magnaflow x-pipe resonator then go through a set of magnaflow mufflers should give you a nice deep bass classic tone with no drone. |
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02-06-2023, 11:07 AM
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#5 |
 Drives: 2018 camaro 2ss Join Date: Nov 2018
Location: Riverside CA
Posts: 93
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I have 2inch header to stock muffler and I dont have drone. Car isnt too loud either until you floor it. Very much recommend.
As for where to find one, check offer up? Or nearby muffler shop to keep an eye out for you in case some dude does a muffler delete and leaves his muffler
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IG Redline_2ss
Rotofab CAI ARH headers E85 MSD IM 103MM NW TB |
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02-06-2023, 03:34 PM
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#6 | |
        
Drives: 2017 1SS 6spd Join Date: Jan 2011
Location: Utah
Posts: 2,869
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Quote:
2: Yes 3: green cats aren't better but will provide a bit more noise suppression while not hurting the sound quality. 4: not me, but I did lose the 2nd cats, added Borla's x-pipe, and replaced the "crushed pipe" section with 2 3/4" straight pipe. That works well for me. 
Last edited by Ventmaster; 02-06-2023 at 07:17 PM. |
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02-06-2023, 03:47 PM
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#7 | |
 
Drives: Chevrolet Camaro Join Date: Apr 2022
Location: Maryland
Posts: 133
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Open vs Closed
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Procharger P1X, CSP Big Boy Cam, CSP Headers, LT4 HPFP, LT4 Injectors, JMS BAP - 722WHP
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02-07-2023, 12:03 AM
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#8 | |
    
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,601
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Quote:
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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 |
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02-24-2023, 07:39 PM
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#9 |
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Drives: SS 6 speed of course Join Date: Jan 2016
Location: Hilo, HI
Posts: 4,316
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I run the 2 cats, and this Borla https://www.americanmuscle.com/borla...ler-60608.html and the factory suitcase and it is STILL loud at full boost 7200 RPM. I've run the stock factory headers 4 cats (front two modified for flow), Borla 60608, factory squash pipes, suitcase muffler and it actually was kind of quite but not really, still could hear the big cam idle.
Long story short the 60608 help a lot, cats 2 or 4 helped alot. I aslo did LT headers and dual cats and I really liked that sound.
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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.
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02-24-2023, 08:17 PM
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#10 | |
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Drives: 6th gen Join Date: Aug 2013
Location: US
Posts: 3,675
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Quote:
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‘22 2SS 1LE M6 Summit White - RF, Flexfuel, LT2 intake, 95mm tb, ATI udp, VT ramair, full 28” dragpack - 11.68@122
‘16 1SS M6 LT2 intake + boltons on DR 11.0@126+ (Sold) |
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02-25-2023, 06:46 AM
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#11 |
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Drives: 2022 Camaro 2SS A10 Join Date: Jul 2022
Location: FL
Posts: 524
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Tour and ice modes are quiet with headers and stock NPP muffler/exhaust. However, valves are open upon starting so it will still be loud initially. I just did a Corsa NPP change out this past weekend and gave away my stock NPP suitcase to a member of the VA Camaro club. Like previously mentioned, find a used stock NPP suitcase/muffler and install it and it will quiet it down some as long as you are not in Sport or Track modes.
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2022 Camaro 2SS/ Whipple 3.0 / 2"Headers/ PRC LTX Heads/ Forged Internals/LT4 fueling/ DSX Aux/
DSX Flex Fuel/ Meth Injection/ Katech 112 TB/ RotoFab Big Gulp/ Corsa NPP/ Various exterior mods |
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02-25-2023, 07:15 AM
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#12 |
Drives: 2017 Camaro SS, 2011 Corvette GS Join Date: Feb 2019
Location: Erlanger, Kentucky 41018
Posts: 815
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Add cats and the stock NPP. No drone and quiet when cruising. Race car loud with full throttle.
Wakes the dead on cold start, but very quiet idling after a couple of minutes. |
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02-26-2023, 09:51 AM
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#13 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,796
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Add resonators to X pipe and put a stock NPP muffler back on. Preferably a ZL1 unit if you can find one.
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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 |
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02-26-2023, 03:41 PM
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#14 | |
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Account Suspended
Drives: 17' Chevy Kamaro SS 6 speed Join Date: Mar 2022
Location: US
Posts: 337
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Quote:
Will also deepen it and remove all rasp. |
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