2010 L99 exhaust question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

SirBilliam · 05-08-2017, 12:49 PM

I have a 2010 SS with the L99 engine, and I did a muffler delete on it back in November. Initially, the car was much louder than before, when it only had cherry bomb glass packs. Everyone in my family commented on how much louder it was. For some reason, the car does not seem as loud as it was anymore, even during cold starts (outside temp ~55). Even people who haven't heard the car since the initial delete have asked why it is quieter. Does anyone know what might cause this? I still have the resonators on to eliminate cabin drone, but I want to find a way to make it a bit (not a lot) louder. Any suggestions? Thanks!

krisprz2010camaross · 05-08-2017, 12:55 PM

You probably just got used to the way it sounds. I thought my car was loud when I got headers and such done, but now I think it's quiet again. Lol

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SirBilliam · 05-08-2017, 12:57 PM

Quote:

Originally Posted by krisprz2010camaross

You probably just got used to the way it sounds. I though my car was loud when I got headers and such done, but now I think it's quiet again. Lol

Sent from my iPhone using Tapatalk

I don't think it is just that. Like I said, people who don't hear it all the time think it got quieter

krisprz2010camaross · 05-08-2017, 01:14 PM

Quote:

Originally Posted by SirBilliam

I don't think it is just that. Like I said, people who don't hear it all the time think it got quieter

Well idk what to tell you then. Get headers or remove the resonators. A muffler delete shouldn't make your exhaust quieter.

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Kens ss · 05-08-2017, 07:53 PM

My L99 had muffler and resonater delete, with Xmidpipe when I bought it. Sounded great. AFM a little annoying but not terrible.
I since added long tube headers and hi-flow cats. Now sounds AWESOME! I got a tune as well so no more AFM.
Car has a great exhaust note, not obnoxious unless you go to WOT! I love the sound and see no need for an axle back system.
Then again exhaust sound is a personal choice and taste can very widely.

Pro Stock John · 05-08-2017, 09:20 PM

You've experienced some hearing loss, that's why.

QUICRNU · 05-08-2017, 10:00 PM

Maybe he has a Clog?

Cats maybe, although it is more likely to be ear wax/the initial shock has worn off.

You can check your cats and resonator, or wait for it to start running really really poorly.

Download a Decibel meter on your phone... eliminate as many variables as possible, like wind, road noise etc, to a control test to see what it reads next to the car at idle and maybe a certain RPM... doesn't help from then til now.... but if it is getting worse, at least you would know.

After that, Headers and High Flows are in order.

Gunmetal Speedster · 05-09-2017, 12:15 AM

Honestly I think we just get used to our exhausts. For you it may be different as you said you've had a few others verify it's quieter.

In my case, I have longtubes, no cats, (muffler delete at one point) and now the SW retro catback. So it's not close to quiet. I do feel it's a lot less loud now though, even though standing outside and listening to someone else drive it I remind myself it's in my head haha.

Avenging Orange · 05-09-2017, 12:52 AM

On the cheap....get rib of that crappy resontaor thingy. Add a resonated X Pipe.
On the flip side....exhaust starts up front. The proper way is headers, hiflo cats on stock exhaust. Oh, and eliminate that annoying AMF.

Rubbershredder · 05-10-2017, 03:27 PM

When i got my headers and cat deletes i thought it was pretty loud (also have NPP). Now i think it's quite my neighbors dont though lol

SirBilliam · 06-14-2017, 02:10 AM

So I decided to go ahead and install a Corsa Powercore CAI. Holy crap, that thing makes my exhaust roar! I'm positive that it was my stock intake holding back my exhaust. The sounds I get upon acceleration and startup are music to my ears. Not to mention I can definitely feel a difference in HP and accel times. Totally worth spending an hour in the Texas heat installing it!

WoodBoss · 06-16-2017, 08:43 AM

CAI, Long Tube Headers, no CATs, factory H Pipe & Muffler Delete is loud and free flowing plus the car will be about 50+ lbs lighter.

Avenging Orange · 06-16-2017, 10:12 AM

Quote:

Originally Posted by SirBilliam

So I decided to go ahead and install a Corsa Powercore CAI. Holy crap, that thing makes my exhaust roar! I'm positive that it was my stock intake holding back my exhaust. The sounds I get upon acceleration and startup are music to my ears. Not to mention I can definitely feel a difference in HP and accel times. Totally worth spending an hour in the Texas heat installing it!

A CAI will not change the exhaust in any way. You are hearing the air being drawn into the engine. Again, its new to you and it will sound great for awhile....then it'll be just like before....you get used to it. But im glad you are happy again.

Jrichards73 · 06-16-2017, 09:26 PM

Quote:

Originally Posted by Avenging Orange

A CAI will not change the exhaust in any way. You are hearing the air being drawn into the engine. Again, its new to you and it will sound great for awhile....then it'll be just like before....you get used to it. But im glad you are happy again.

If your stock air filter is suffocating the engine because it needs to be replaced and the ECU is compensating for it, it will absolutely make a difference. But good part for good part, I would agree, but he started with an obvious fault and I'll bet would have had same result with just a new filter. Just my opinion though.

05-08-2017, 12:49 PM	#1
SirBilliam Drives: 2010 Chevrolet Camaro SS Join Date: May 2017 Location: Texas Posts: 8	2010 L99 exhaust question I have a 2010 SS with the L99 engine, and I did a muffler delete on it back in November. Initially, the car was much louder than before, when it only had cherry bomb glass packs. Everyone in my family commented on how much louder it was. For some reason, the car does not seem as loud as it was anymore, even during cold starts (outside temp ~55). Even people who haven't heard the car since the initial delete have asked why it is quieter. Does anyone know what might cause this? I still have the resonators on to eliminate cabin drone, but I want to find a way to make it a bit (not a lot) louder. Any suggestions? Thanks!

05-08-2017, 12:55 PM	#2
krisprz2010camaross Drives: 2010 Camaro 2ss/Rs Transformers Join Date: Aug 2014 Location: Yorba Linda, California Posts: 1,561	2010 L99 exhaust question You probably just got used to the way it sounds. I thought my car was loud when I got headers and such done, but now I think it's quiet again. Lol Sent from my iPhone using Tapatalk __________________ YouTube:Krisprz garage Insta:kris__perez & krisprz_garage LS3 conversion Vararam intake(tune model) Kooks LT headers & cats delete Corsa ZL1 3" exhaust RedBarn Racing Tune CMS Stage 3 Cam AFR CNC ported heads MSD Spark plug wires LNC-2000 Launch controller NGK TR6 Spark Plugs 1le strut tower brace-TPIS spacers Nick Williams 102mm throttle body Fast lsxr 102 intake manifold Slp 25% UDP Katech Tensioner Pulley Circle D 3600-3700 multi disk Stall GM 3.91 gears DDS carbon fiber driveshaft ZL1 fuel pump & injectors Flex fuel sensor(91/E85) https://wheelwell.com/kris-perez Last edited by krisprz2010camaross; 05-08-2017 at 10:05 PM.

05-08-2017, 07:53 PM	#5
Kens ss Drives: 2011 SS/RS , L99 convertible Join Date: Aug 2015 Location: NE Ohio Posts: 310 View My Garage	My L99 had muffler and resonater delete, with Xmidpipe when I bought it. Sounded great. AFM a little annoying but not terrible. I since added long tube headers and hi-flow cats. Now sounds AWESOME! I got a tune as well so no more AFM. Car has a great exhaust note, not obnoxious unless you go to WOT! I love the sound and see no need for an axle back system. Then again exhaust sound is a personal choice and taste can very widely. __________________

05-08-2017, 09:20 PM	#6
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,221	You've experienced some hearing loss, that's why. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

05-08-2017, 10:00 PM	#7
QUICRNU Drives: Z06 wannabe Join Date: Feb 2015 Location: Daytona Beach, FL Posts: 1,200	Maybe he has a Clog? Cats maybe, although it is more likely to be ear wax/the initial shock has worn off. You can check your cats and resonator, or wait for it to start running really really poorly. Download a Decibel meter on your phone... eliminate as many variables as possible, like wind, road noise etc, to a control test to see what it reads next to the car at idle and maybe a certain RPM... doesn't help from then til now.... but if it is getting worse, at least you would know. After that, Headers and High Flows are in order. __________________ Apex Focused

05-09-2017, 12:15 AM	#8
Gunmetal Speedster Drives: Savitar; The 500rwhp N/A Monster! Join Date: Aug 2016 Location: Middletown, Ohio Posts: 2,914 View My Garage	Honestly I think we just get used to our exhausts. For you it may be different as you said you've had a few others verify it's quieter. In my case, I have longtubes, no cats, (muffler delete at one point) and now the SW retro catback. So it's not close to quiet. I do feel it's a lot less loud now though, even though standing outside and listening to someone else drive it I remind myself it's in my head haha. __________________ **SOLD504HP/433**TQ \| Night Fury cammed • Cold Air Inductions intake • Bo White ported TB • Speed Engineering 1 7/8 longtubes • NPP catback • QTP low profile cutouts • Powerbond 25% UDP • 3.73 gears • JRE scoop • ZL1 grille • R1 Concepts drilled/slotted rotors • built/tuned by Weapon X Motorsports Instagram \| YouTube \| Build Thread

05-09-2017, 12:52 AM	#9
Avenging Orange Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010 Location: Clermont, IN Posts: 3,297	On the cheap....get rib of that crappy resontaor thingy. Add a resonated X Pipe. On the flip side....exhaust starts up front. The proper way is headers, hiflo cats on stock exhaust. Oh, and eliminate that annoying AMF. __________________ 2010 Inferno Orange 2SS/RS M6 Black Leather, Sun Roof, OBX Headers, Borla touring axle back, Cold Air Inductions CAI , non synthetic fluids, BMR total bushing upgrade/1" lowering springs, DSE 32mm rear sway bar. GM fe4 shocks/struts/LCA's, AAM 3.91 diff, Vertini RFS1.8 20x9 +30. Conti ExtremeContact Sport 275/35/20. sjm autoprod ABL dash kit. Mike Norris tuned 413/419. Avenging Orange: 43 years of not buying into the Hype........and damn proud of it!! https://youtu.be/9JD9it6SmB8 https://youtu.be/xmelTlEzI34 KICKING CANCERS ASS SINCE 2015!!

05-10-2017, 03:27 PM	#10
Rubbershredder Drives: 13 2ss Join Date: Oct 2016 Location: Ct Posts: 25 View My Garage	When i got my headers and cat deletes i thought it was pretty loud (also have NPP). Now i think it's quite my neighbors dont though lol

06-14-2017, 02:10 AM	#11
SirBilliam Drives: 2010 Chevrolet Camaro SS Join Date: May 2017 Location: Texas Posts: 8	So I decided to go ahead and install a Corsa Powercore CAI. Holy crap, that thing makes my exhaust roar! I'm positive that it was my stock intake holding back my exhaust. The sounds I get upon acceleration and startup are music to my ears. Not to mention I can definitely feel a difference in HP and accel times. Totally worth spending an hour in the Texas heat installing it!

06-16-2017, 08:43 AM	#12
WoodBoss "Old School" Drives: 2010 2SS L99 Join Date: Apr 2015 Location: Sherrills Ford, NC Posts: 1,294	CAI, Long Tube Headers, no CATs, factory H Pipe & Muffler Delete is loud and free flowing plus the car will be about 50+ lbs lighter.