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Old 08-17-2009, 04:04 PM   #1
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SLP Loud Mouth II Issue

I installed the SLP Loud Mouth II this weekend on my 2SS A6. I know that there was some droning when cruising on the freeway that others had mentioned. I get a fairly loud very deep bassy noise and slight vibration when I hit cruising speed weather at fast or slow speeds. It's fine when accelerating. I re-checked the exhaust today and found no leaks and all the muffler mounts are good. The only thing I can think of is that when I reach cruising speed it shifts to 4 cylinders weather I'm on the street or freeway. I don't know the details on when and why the AFM kicks in? If this continues I'll have to put the stock mufflers back on. :(
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Old 08-17-2009, 04:06 PM   #2
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You can tune your ECM to change when the AFM kicks on. I'm very sure there are Camaro tuners in AZ that can help you.
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Old 08-17-2009, 04:06 PM   #3
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Did you remove the big baffle or just the mufflers?
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Old 08-17-2009, 04:08 PM   #4
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Unfortunately, this is not going to go away unless you retune to delete the Active Fuel Management. I figured this would be a problem with the auto and aftermarket exhausts when switching to V4 mode. Tuning the car could (depending on your dealer) void your warranty. That's why I went with electronic exhaust diverters. I can use the stock exhaust on the highway and have it scream on the street.

So I guess it all depends on if you're comfortable deleting the AFM.
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Old 08-17-2009, 04:10 PM   #5
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Did you remove the big baffle or just the mufflers?

It's an axle back system.
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Old 08-17-2009, 04:12 PM   #6
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I have the SLP Loudmouths and I noticed the noise but its not bad at all...it sure beats the stock sound any which way you look at it
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Old 08-17-2009, 04:23 PM   #7
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Thanks for the info! Would it be safe to assume that all axle back systems for the A6 would have the same issue? Now to figure out which direction to take.....................................
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Old 08-17-2009, 04:29 PM   #8
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Quote:
Originally Posted by Missile Man View Post
I installed the SLP Loud Mouth II this weekend on my 2SS A6. I know that there was some droaning when cruzing on the freeway that others had mentioned. I get a fairly loud very deep bassy noise and slight vibration when I hit cruzing speed weather at fast or slow speeds. It's fine when accelerating. I re-checked the exhaust today and found no leaks and all the muffler mounts are good. The only thing I can think of is that when I reach cruzing speed it shifts to 4 cylinders weather I'm on the street or freway. I don't know the details on when and why the AFM kicks in? If this continues I'll have to put the stock mufflers back on. :(
I will buy it!!
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Old 08-17-2009, 04:49 PM   #9
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I have the LS3 (no Active Fuel Management) and it does the same thing (at about 1800 RPM). Don't go tuning out the AFM because it won't help. I don't really even notice it anymore, but I'm hoping that headers and/or gear in the future will completely get rid of the drone.
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Old 08-17-2009, 04:52 PM   #10
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Thanks for the info! Would it be safe to assume that all axle back systems for the A6 would have the same issue? Now to figure out which direction to take.....................................
Hey Missile Man,

My car should be in Tucson Tues or Weds, I already received my SLP LM 1. I plan on installing this weekend, I will let you know how it sounds.
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Old 08-17-2009, 04:54 PM   #11
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I will buy it!!
Crap you beat me to it
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Old 08-17-2009, 05:25 PM   #12
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I have the LS3 (no Active Fuel Management) and it does the same thing (at about 1800 RPM). Don't go tuning out the AFM because it won't help. I don't really even notice it anymore, but I'm hoping that headers and/or gear in the future will completely get rid of the drone.
Man, this makes no sense. They sound great during acceleration. Then at cruze they sound like a rice rocket with a 55 gallon drum for a muffler with a 4 inch exhaust pipe............................. well maybe not that bad.
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Old 08-17-2009, 05:31 PM   #13
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Hey Missile Man,

My car should be in Tucson Tues or Weds, I already received my SLP LM 1. I plan on installing this weekend, I will let you know how it sounds.
Hey azburk,

Good deal with your Camaro! The question is....... will you get any sleep tonight ....................
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Old 08-17-2009, 05:33 PM   #14
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Hey azburk,

Good deal with your Camaro! The question is....... will you get any sleep tonight ....................
No!!!!!Like a kid on Christmas eve, I thought I was too old to feel this way!
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Old 08-17-2009, 08:15 PM   #15
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i just orderd the LMII. Is the drone that bad? one guy told me his L99 had NO drone.
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Old 08-17-2009, 09:01 PM   #16
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I read that too.
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Old 08-18-2009, 06:09 AM   #17
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what measures do you take to prevent drone?
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Old 08-18-2009, 09:58 AM   #18
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i just orderd the LMII. Is the drone that bad? one guy told me his L99 had NO drone.
For me it's a bit much. I didn't expect it to be so prevalent. Maybe I received a bad set but without a comparison it's hard to say. I plan on keeping them on for a couple of weeks to see if anything changes. I'm calling SLP today to get their advice. It shouldn't be difficult to re-install the stock mufflers if I can find a sleeve and clamps to fit the exhaust pipe. This is just my experience, you might like the SLP system.
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Old 08-18-2009, 11:13 AM   #19
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For me it's a bit much. I didn't expect it to be so prevalent. Maybe I received a bad set but without a comparison it's hard to say. I plan on keeping them on for a couple of weeks to see if anything changes. I'm calling SLP today to get their advice. It shouldn't be difficult to re-install the stock mufflers if I can find a sleeve and clamps to fit the exhaust pipe. This is just my experience, you might like the SLP system.
for the majorty of posts I read about SLPs LMII there pretty dang awesome!! so thats the reason I went with them plus some sound clips helped too.
maybe the placement of the mufflers has something to do with the drone.
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Old 08-18-2009, 03:58 PM   #20
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Have an L99 with LMII. NO drone at any speed. If you listen, you CAN tell when AFM kicks in -- but not an unpleasant sound, just quieter. Mine could be louder. Four cylinder mode still sounds like a V8 to me but is pretty quiet.

Now you can hear the exhaust at most speeds, before the switch, it was as quiet as new Impala. If you don't want to hear something from your exhaust, don't change from stock -- but that's why I switched.
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Old 08-18-2009, 04:09 PM   #21
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For me it's a bit much. I didn't expect it to be so prevalent. Maybe I received a bad set but without a comparison it's hard to say. I plan on keeping them on for a couple of weeks to see if anything changes. I'm calling SLP today to get their advice. It shouldn't be difficult to re-install the stock mufflers if I can find a sleeve and clamps to fit the exhaust pipe. This is just my experience, you might like the SLP system.
That's a good idea. In my experience, exhaust takes a few heat cycles to really work itself out. This has been the case with my Magnaflow, Flowmaster, and Hooker.
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Old 08-18-2009, 05:55 PM   #22
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Have an L99 with LMII. NO drone at any speed. If you listen, you CAN tell when AFM kicks in -- but not an unpleasant sound, just quieter. Mine could be louder. Four cylinder mode still sounds like a V8 to me but is pretty quiet.

Now you can hear the exhaust at most speeds, before the switch, it was as quiet as new Impala. If you don't want to hear something from your exhaust, don't change from stock -- but that's why I switched.
It's great that your happy with yours. Mine is fine when starting, accelerating, and decelerating. There's a difference between "hearing something from your exhaust" and hearing how a V8 should sound with performance mufflers. Wait, I'm hearing something from my exhaust now........
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Old 08-18-2009, 06:04 PM   #23
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for the majorty of posts I read about SLPs LMII there pretty dang awesome!! so thats the reason I went with them plus some sound clips helped too.
maybe the placement of the mufflers has something to do with the drone.
The sound clips sold me too. Hind sight is bliss as I noticed now that none of the clips are when cruising at a constant speed, just starting, accelerating, and decelerating. I'll see what I can find out from SLP when I call them. I'm hoping it's a fluke as they do sound good otherwise.
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Old 08-18-2009, 06:10 PM   #24
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i have got a 2008 silverado i cut and replace the muffler with a flowmaster series which is just a 2 chamber and when the AFM kicks it into 4cyl mode it sounds like honning noise i think thisis what you are hearing.....
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Old 08-18-2009, 11:19 PM   #25
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For me it's a bit much. I didn't expect it to be so prevalent. Maybe I received a bad set but without a comparison it's hard to say. I plan on keeping them on for a couple of weeks to see if anything changes. I'm calling SLP today to get their advice. It shouldn't be difficult to re-install the stock mufflers if I can find a sleeve and clamps to fit the exhaust pipe. This is just my experience, you might like the SLP system.
We get calls regarding this same issue with various SLP systems. I would honestly suggest going with Magnaflow's Street Series Cat-Back or even the Comp Series Cat-Back. We use a resonated X-Pipe which helps a lot with scavaging and the muffler design kills the drone. I hate drone!

Let us know if we can be of any help!

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