Leave your stock mufflers -WHY! - Page 5 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

jojohn33 · 07-05-2009, 11:12 AM

Do I remeber correctly in that get G8 is the same way only worse because it had some kind of "stuffing inside to make it even less loud?

GREAT PUMPKIN · 07-05-2009, 08:12 PM

Quote:

Originally Posted by Edrock

You raise an interesting question. Since this car has 2 sets of CATs, would it still pass inspection if the rear set was removed leaving the front set hooked to the O2 sensors?

Also, Did the sound inside the cabin increase when you deleted the resonators??

The place that did my exhaust is also a N.C. inspection site and as far as they could tell while I was there, it still will pass the inspection.

The increase in sound is more noticable outsie the car, but I can tell a difference in the car if I am giving it a little extra throttle. The few people who have heard it were able to tell there was a difference, but I think that I would be happier with a nice set of High Flow Cats.

hot ss · 07-05-2009, 09:46 PM

Quote:

Originally Posted by ADM PERFORMANCE

I wanted to bring attention to all .....The factory muffler is a straight through design as I have found on every SS vehicle(TRAILBLAZER SS,CAMAROSS,HHRSS) I have ever worked on.

So why change your exhaust,how are guys claiming power differences by replacing them,,both good and bad...Please explain!

Just an observation -

show us a pic of the other third of the can that we cannot see.

oxidizr · 07-27-2009, 05:31 PM

GM has a Manual and Automatic V8 Exhaust and a different system for the V6 altogether.

The systems are CHAMBERED exhaust systems and are not traditional straight through systems.

The attached pictures are for the L99 Automatic V8's

SGOS252382 · 07-27-2009, 05:44 PM

Quote:

Originally Posted by oxidizr

GM has a Manual and Automatic V8 Exhaust and a different system for the V6 altogether.

The systems are CHAMBERED exhaust systems and are not traditional straight through systems.

The attached pictures are for the L99 Automatic V8's

What the heck is going on with that?

I can't wait for my GMPP off road axle back to show up. Thats some crazy looking stuff going on with that muffler on the L99.

Verio · 07-27-2009, 05:50 PM

And thats why my car sounds like a wimp :(

okie2 · 07-27-2009, 07:01 PM

Quote:

Originally Posted by SGOS252382

What the heck is going on with that?

I can't wait for my GMPP off road axle back to show up. Thats some crazy looking stuff going on with that muffler on the L99.

SGOS, are you going to try and post video/sound? The one posted on the "exhaust" link doesn't specify which GMPP version it is.

rpepka · 07-27-2009, 08:01 PM

Quote:

Originally Posted by oxidizr

GM has a Manual and Automatic V8 Exhaust and a different system for the V6 altogether.

The systems are CHAMBERED exhaust systems and are not traditional straight through systems.

The attached pictures are for the L99 Automatic V8's

Looks like something from the twilite zone

bgbadss · 09-16-2009, 12:27 AM

Quote:

Originally Posted by FISHTAIL

Just want the V6 to sound more like the V8. I want that deeper note throughout the acceleration range, even at the higher rpms where it starts to sound a bit like a ricer.

Don't tell me to get the V8, that's not going to happen!

Ain't happening unless you add 2 more cylinders.

bgbadss · 09-16-2009, 12:39 AM

Quote:

Originally Posted by camaro5

They absolutely increase backpressure. They minimize it, but cannot eliminate it.

The L99 with AFM active sounds - hmm - not so good, running on 4 cylinders.

They HAVE to keep it quiet, and rather than give the LS3 better exhaust, they both get the quiet version.

.

Boy, are you right about that. My buddy put a axleback on his L99 and it sounds great until the 4 cyl thing happens under no load. Then it just sounds fugly as hell. Has anyone been able to tune this thing out? :(

Mzodarg · 09-16-2009, 01:17 AM

FWIW- I had my J-cans removed yesterday, tips rewelded all for $60. This was done on a 2SS A6. One thing I noticed when the car was in the air was that it appears to have a muffler or another CAT just past the transmission. It looks as though is very restrictive as it has some sort of cross member a crossed it and the muffler/cat is reduced significantly in order for the cross member to pass over it.

First impression of the trashcan delete is favorable, slight drone in car, but tolerable. Seems to have a noticeable low end torque increase, certainly does not sound like my muffler fell off and honestly I did not notice the AFM activating via sound change- may be audible outside the car-but who cares- Boston Aucustic (sp) takes care of that.

Just my experience and for now this is what I am sticking with until the aftermarket can say POP. No way I am paying the prices that are being demanded for the current offerings.

Regards,
Mike

thebrainhart · 09-16-2009, 01:22 AM

Quote:

Originally Posted by Mzodarg

FWIW- I had my J-cans removed yesterday, tips rewelded all for $60. This was done on a 2SS A6. One thing I noticed when the car was in the air was that it appears to have a muffler or another CAT just past the transmission. It looks as though is very restrictive as it has some sort of cross member a crossed it and the muffler/cat is reduced significantly in order for the cross member to pass over it.

First impression of the trashcan delete is favorable, slight drone in car, but tolerable. Seems to have a noticeable low end torque increase, certainly does not sound like my muffler fell off and honestly I did not notice the AFM activating via sound change.

I agree, I had my mufflers chopped off yesterday, straight piped, with nice tips, left the resonator and all 4 cats. Course I do also have Doug Thorley shorties too.

It has almost an exotic V8 (ie ferrari, lambo V8) tone to it while driving at times. Sounds pretty cool. Louder than stock, of course, but isnt too loud, I think it sounds good. Startup and idle is cool too.

Even in V4 mode, I dont mind it. Wierdest part is when it switches from V8 to V4, and back to V8, it has a moment of wierd sound. But it is definately livable.

Here is a quick video of it, cut short, as my phone died while filming:

Mzodarg · 09-16-2009, 01:31 AM

thebrainhart,
Mine sounds very similiar- no Headers on mine yet, CAI is next and then headers. I, like you am pleased with sound!

Mike

HDDAN · 09-16-2009, 06:15 AM

I want the cops to hear that I have my foot in it so that they can be ready with their radar gun to help me to see if my speedometer is really accurate.

Kamaro4437 · 09-16-2009, 06:56 AM

Brainhart thanks for posting that vid. It has made up my mind. Thats a good and cheap alternative that sounds really great. It sounds better than alot of the mufflers on here and sounds similar to a loudmouth just a little milder which is perfect. Tell me did it hurt performance torque wise in the low end when launching in your car? Or is it better. A drive by with you getting down on the gas video would be awesome to.

prostock69 · 09-16-2009, 07:31 AM

Quote:

Originally Posted by fldrummer

1. They're ugly as sin (that alone is reason enough)!

2. Too quiet and tame.

3. More unnecesarry dead weight (18 lbs. each).

This was EXACTLY what I was going to post!

Just put on SLP Loudmouth II and the difference is AMAZING! Once we get the ARHeaders on, look out!

fldrummer · 09-16-2009, 04:44 PM

Quote:

Originally Posted by prostock69

This was EXACTLY what I was going to post!

Just put on SLP Loudmouth II and the difference is AMAZING! Once we get the ARHeaders on, look out!

Holy s***! You're even from my home town! Go BHS Beavers (what a lame school mascot, but oh well)! LOL! Did that have anything to do with why you chose orange?

Missile Man · 09-16-2009, 11:27 PM

Quote:

Originally Posted by bgbadss

Boy, are you right about that. My buddy put a axleback on his L99 and it sounds great until the 4 cyl thing happens under no load. Then it just sounds fugly as hell. Has anyone been able to tune this thing out? :(

Anyone with the L99 drone have the AFM tuned out and have the drone go away????????? Just need to verify the fix.

Lydon · 09-17-2009, 09:25 AM

Quote:

Originally Posted by ADM PERFORMANCE

I wanted to bring attention to all .....The factory muffler is a straight through design as I have found on every SS vehicle(TRAILBLAZER SS,CAMAROSS,HHRSS) I have ever worked on.

So why change your exhaust,how are guys claiming power differences by replacing them,,both good and bad...Please explain!

Just an observation -

It's all about noise for me - I feel the car is fast enough for what I am using it for -- but I want to hear it and I want to be heard.

gjordon · 09-17-2009, 11:22 AM

Quote:

Originally Posted by fldrummer

1. They're ugly as sin (that alone is reason enough)!

2. Too quiet and tame.

3. More unnecesarry dead weight (18 lbs. each).

+1

I opted for the axle back LM II.. just wanted just a little deeper tone and still fairly quiet inside and got exactly what I wanted.

lgndlt5 · 11-24-2009, 12:48 PM

Thanks everyone for the cutaway photos and specific information. It aappears that the L99(automatic) muffler is distinguishable from the LS3 (manual) visually by the number of visible spot welds on top of the OEM muffler. The more restrictive 'chambered/stuffed' one has six (6) visible spot welds on the top while the "straight thru" LS3 has only 3 visible spot welds on top. Is this correct? Also has anyone cut open a V6 LLT muffler? I sure would like to see what is going on inside that one also. Thanks. LGNDLT5

BLACK10 · 11-24-2009, 03:57 PM

Quote:

Originally Posted by lgndlt5

Thanks everyone for the cutaway photos and specific information. It aappears that the L99(automatic) muffler is distinguishable from the LS3 (manual) visually by the number of visible spot welds on top of the OEM muffler. The more restrictive 'chambered/stuffed' one has six (6) visible spot welds on the top while the "straight thru" LS3 has only 3 visible spot welds on top. Is this correct? Also has anyone cut open a V6 LLT muffler? I sure would like to see what is going on inside that one also. Thanks. LGNDLT5

yep, 3 welds on the LS3

Boricua · 08-02-2011, 05:30 PM

Have you guys noticed improvement in HP, by deleting the mufflers or replacing them? Or MPG? I'm happy with mine. I see between 22 to 26 on HWY.

UNRIVALED SS · 08-02-2011, 06:29 PM

The tech at MTI said the same thing. The stock mufflers flow really well.

axis · 08-02-2011, 06:41 PM

Quote:

Originally Posted by Boricua

Have you guys noticed improvement in HP, by deleting the mufflers or replacing them? Or MPG? I'm happy with mine. I see between 22 to 26 on HWY.

Seriously? You necromanced a 2yr old thread to ask a question that is answered just about every exhaust thread?

07-27-2009, 05:31 PM	#104
oxidizr Drives: 2010 Cadillac CTS, 2011 Camaro SS Join Date: Jul 2009 Location: So Cal Posts: 21 View My Garage	MISLEADING INFORMATION GM has a Manual and Automatic V8 Exhaust and a different system for the V6 altogether. The systems are CHAMBERED exhaust systems and are not traditional straight through systems. The attached pictures are for the L99 Automatic V8's Attached Images

07-27-2009, 05:50 PM	#106
Verio Taking it 1 day at a time Drives: 2010 Chevy Camaro 2SS/RS Auto Join Date: Apr 2009 Location: San Antonio, TX Posts: 759 View My Garage	And thats why my car sounds like a wimp :( __________________ Order#: NJWGTF 1100, Preliminary order accepted 04/27/2009 6000, Delivered to the customer 07/23/2009 - 3 Months (worth the wait!!)

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07-05-2009, 11:12 AM	#101
jojohn33 Drives: tt Join Date: Aug 2008 Location: wv Posts: 48	Do I remeber correctly in that get G8 is the same way only worse because it had some kind of "stuffing inside to make it even less loud?

09-16-2009, 01:17 AM	#111
Mzodarg Remembering those in Blue Drives: 2010 Camaro 2SS Blk w/IOM Int Join Date: Sep 2009 Location: Oklahoma Posts: 480	FWIW- I had my J-cans removed yesterday, tips rewelded all for $60. This was done on a 2SS A6. One thing I noticed when the car was in the air was that it appears to have a muffler or another CAT just past the transmission. It looks as though is very restrictive as it has some sort of cross member a crossed it and the muffler/cat is reduced significantly in order for the cross member to pass over it. First impression of the trashcan delete is favorable, slight drone in car, but tolerable. Seems to have a noticeable low end torque increase, certainly does not sound like my muffler fell off and honestly I did not notice the AFM activating via sound change- may be audible outside the car-but who cares- Boston Aucustic (sp) takes care of that. Just my experience and for now this is what I am sticking with until the aftermarket can say POP. No way I am paying the prices that are being demanded for the current offerings. Regards, Mike

09-16-2009, 01:31 AM	#113
Mzodarg Remembering those in Blue Drives: 2010 Camaro 2SS Blk w/IOM Int Join Date: Sep 2009 Location: Oklahoma Posts: 480	thebrainhart, Mine sounds very similiar- no Headers on mine yet, CAI is next and then headers. I, like you am pleased with sound! Mike

09-16-2009, 06:15 AM	#114
HDDAN Drives: 2010 Camaro 1SS 2007 HD FLSTC Join Date: Aug 2009 Location: Boston MA Posts: 1,512	I want the cops to hear that I have my foot in it so that they can be ready with their radar gun to help me to see if my speedometer is really accurate.

09-16-2009, 06:56 AM	#115
Kamaro4437 Drives: 2 64 1/2 coupes and 66 fastbac Join Date: Aug 2009 Location: LA Posts: 70	Brainhart thanks for posting that vid. It has made up my mind. Thats a good and cheap alternative that sounds really great. It sounds better than alot of the mufflers on here and sounds similar to a loudmouth just a little milder which is perfect. Tell me did it hurt performance torque wise in the low end when launching in your car? Or is it better. A drive by with you getting down on the gas video would be awesome to.

11-24-2009, 12:48 PM	#121
lgndlt5 Drives: 2010 1lt Join Date: Aug 2009 Location: Wisconsin Posts: 57	Thanks everyone for the cutaway photos and specific information. It aappears that the L99(automatic) muffler is distinguishable from the LS3 (manual) visually by the number of visible spot welds on top of the OEM muffler. The more restrictive 'chambered/stuffed' one has six (6) visible spot welds on the top while the "straight thru" LS3 has only 3 visible spot welds on top. Is this correct? Also has anyone cut open a V6 LLT muffler? I sure would like to see what is going on inside that one also. Thanks. LGNDLT5

08-02-2011, 05:30 PM	#123
Boricua Drives: 2010 2SS Yellow Camaro Join Date: Jan 2010 Location: El Paso, Texas Posts: 57 View My Garage	Have you guys noticed improvement in HP, by deleting the mufflers or replacing them? Or MPG? I'm happy with mine. I see between 22 to 26 on HWY.

08-02-2011, 06:29 PM	#124
UNRIVALED SS Drives: 2010 Camaro 1SS/RS L99 Join Date: Aug 2010 Location: Tennessee Posts: 212 View My Garage	The tech at MTI said the same thing. The stock mufflers flow really well.