Axlebacks not as loud anymore - Mustang Evolution

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Old 02-03-2015, 04:16 AM   #1
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Axlebacks not as loud anymore

So I have flowmaster outlaws. Got them installed at around 1700 miles. Now the car just approached 4100 miles and now they don't sound as loud anymore. I always remember them droning on the freeway at 2000 rpms but they don't drone much anymore. It's a 2014 model. There's no loss in power or anything wrong with the car besides the axlebacks getting a bit quieter. Is it even possible that can be the exhaust just settling or going through some type of break in period?
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Old 02-03-2015, 05:41 AM   #2
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Could it be your loss of hearing from all that noise?
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Old 02-03-2015, 06:56 AM   #3
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Axlebacks not as loud anymore

A lot of the time it is because we get used to a certain sound. I have them as well and I've attempted to tell myself the same thing but I know it's still loud. Have someone else drive your car and listen to it from outside the car to assure yourself. Lol

On a side note. X pipe and headers and you'll know what loud is haha


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Old 02-03-2015, 07:56 AM   #4
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Is it possible they are holding water? That will dampen the sound if so.
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Old 02-03-2015, 08:54 AM   #5
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Is it possible they are holding water? That will dampen the sound if so.
What do you mean by holding in water? In the axlebacks?
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Old 02-03-2015, 09:56 AM   #6
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Hpipe and outlaws here. 3k on them. I think I've just got used to it. Ppl tell me I rattle their car windows and I set off car alarms just cruising by.

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Old 02-03-2015, 10:53 AM   #7
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Lol got any sound clips?


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Old 02-03-2015, 11:00 AM   #8
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I have an off road x pipe and roush axlebacks and it doesn't sound as loud anymore but I know it's me


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Old 02-03-2015, 11:23 AM   #9
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I heard the loudest 5.0 ever yesterday. He left an intersection and was not even slightly on it and it was so loud. I do not want mine like that.

Oh, and back on topic, check for a banana on your tailpipe.
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Old 02-03-2015, 11:30 AM   #10
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What do you mean by holding in water? In the axlebacks?
Yea some axle backs you have to drill weep holes into so water doesn't pool in them and some have them already drilled when you buy them. Not sure if the flowmasters shape would even allow them to hold water but I've heard of it causing exhausts to quiet down if there is water in them.
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Old 02-03-2015, 11:34 AM   #11
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Ren, some mufflers will build up water in them, it happens more if you only drive short distances so they don't get hot enough to evap water...some people will drill small holes in them (normally the low spot) to allow water to drain. Google muffler weep hole
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Old 02-03-2015, 12:10 PM   #12
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I guess when I think about it, it didn't just quiet down all of a sudden. It slowly started getting quieter and quieter.
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Old 02-03-2015, 01:44 PM   #13
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Also carbon buildup will take some of the "sharpness" out of the tone.
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Old 02-03-2015, 01:57 PM   #14
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Also carbon buildup will take some of the "sharpness" out of the tone.
Is there a recommended way to get rid of the carbon build-up? Would there be much of a build-up after 2000 miles?
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Old 02-03-2015, 01:59 PM   #15
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I remember my dad speeding "to burn the carbon out"
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Old 02-03-2015, 02:11 PM   #16
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Do you have a tune? if so hook up your SCT (or whatever) every 2 weeks and do a quick KAM reset. Your computer relearns avertime and mellows the car back out.
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Old 02-03-2015, 02:32 PM   #17
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Is there a recommended way to get rid of the carbon build-up? Would there be much of a build-up after 2000 miles?

It's normal. Usually takes 5k miles(give or take) for any exhaust to fully settle in. Basically instead of sound bouncing off nice clean shiny metal, those sound waves are now hitting soft matte carbon.

Take my Roush exhaust. On a scale of 1-10 10 being loudest. When I installed it it was a 10 on volume. At 3k miles it was about an 8, now at 10k miles it's about a 4-5. But on the flip side the tone is much more pleasant and less tinny.
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Old 02-03-2015, 03:36 PM   #18
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Makes some sense now, thanks. I was like WTF is wrong? I was ready to go buy Borla Ataks this weekend. Is there any type of solution to this?
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Old 02-03-2015, 04:08 PM   #19
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Makes some sense now, thanks. I was like WTF is wrong? I was ready to go buy Borla Ataks this weekend. Is there any type of solution to this?

It happens with all exhaust. Best I can recommend is when listening to videos and stuff online. Try to find "broken in" videos. That's how I ended up with Roush, almost all vids are right after install, I found a Roush vid where the guy had them for like 12k miles and I really liked it.

Now on mufflers with glass packing like stock and some touring models, the reverse is true, after a few thousand miles the packing breaks down and compresses and the exhaust gets louder.
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Old 02-03-2015, 04:18 PM   #20
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I personally like loud and the drone. Need to find a solution. I miss the loudness.
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Old 02-03-2015, 08:55 PM   #21
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Old 02-03-2015, 09:04 PM   #22
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Long tubes and a x pipe. You'll have all the sound you can handle.
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Old 02-03-2015, 09:47 PM   #23
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I am with you 100% I had pype bombs and the sound got mellow to me and way quieter than when I first bought them, then I switched to Roush and the change of tone was a nice change of pace but after about 1.5K miles I'm bored again... I want more volume and more aggressive tone, I want to go offroad x pipe but I am hesitant because of potential trouble if I get caught without cats... Although I love the way Roush sounds with Offroad x and I really want to pull the trigger but I am also looking into a boss 302 h pipe
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Old 02-03-2015, 10:15 PM   #24
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Being in California, I just want to do it the legal way so I don't have to worry about the POPO. I only have axlebacks but thinking if going full on Borla Atak catback.
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Old 02-03-2015, 10:22 PM   #25
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the borla atak cat back is loud, it will be louder than your Outlaws, but you will eventually get bored of it too. The only setup I've seen people in my area not get bored with are off road mid pipes and long tubes, eventually they try an make it quieter lol... But I feel you with the emissions laws its a bummer haha...
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Old 02-03-2015, 11:20 PM   #26
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the borla atak cat back is loud, it will be louder than your Outlaws, but you will eventually get bored of it too. The only setup I've seen people in my area not get bored with are off road mid pipes and long tubes, eventually they try an make it quieter lol... But I feel you with the emissions laws its a bummer haha...
Yeah being here in California sucks when it comes to those type of things. Gonna work on the stance first before I buy another exhaust set-up.
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Old 02-06-2015, 07:36 PM   #27
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the borla atak cat back is loud, it will be louder than your Outlaws, but you will eventually get bored of it too. The only setup I've seen people in my area not get bored with are off road mid pipes and long tubes, eventually they try an make it quieter lol... But I feel you with the emissions laws its a bummer haha...

I disagree I have the borla atak catback and it is extremely loud. I don't think I could ever get bored of the sound. By the way if you're looking at getting the borla atak catback check Amazon because i saved 700$ getting it on Amazon I ended up paying 1064$ shipped.


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Old 02-06-2015, 07:39 PM   #28
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I bet you people could lol. That's completely opinion I'm not satisfied with axle or cat back sound anymore I want something louder, might be because all my mustang friends around here have off road mid pipes or long tubes and I get used to hearing theirs and now my mustang sounds extremely tame to me

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Old 02-06-2015, 07:42 PM   #29
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I bet you people could lol. That's completely opinion I'm not satisfied with axle or cat back sound anymore I want something louder, might be because all my mustang friends around here have off road mid pipes or long tubes and I get used to hearing theirs and now my mustang sounds extremely tame to me

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I can understand what you mean. But if he wants to stay legal I think the loudest he is going to get is borla.


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Old 02-06-2015, 07:48 PM   #30
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Yeah I mean long tubes with high flow catted x... But that's pretty pricey too so there's that to consider and warranty... But I see where your coming from

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Old 02-06-2015, 08:22 PM   #31
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Yeah I mean long tubes with high flow catted x... But that's pretty pricey too so there's that to consider and warranty... But I see where your coming from

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I don't know much about Cali laws but I know they're super strict I don't know if high flows will pass emissions. I know here in jersey when I take my 93 corvette through emissions they hook up to the exhaust to test levels. I don't have to take my mustang till 2018 so I don't know about that.


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Old 02-06-2015, 08:31 PM   #32
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Oh ok in VA long tubes with high flow cats are good to go... But yeah Cali is tough

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Old 02-06-2015, 10:20 PM   #33
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They could be getting low on muffler bearing grease.
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Old 02-07-2015, 09:06 AM   #34
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I have offroad H and SLP loudmouths that shake the walls. I've driven by people and them hold their ears. It mellowed some after a little driving. My wife loves it. Lol. Where you at in VA kaveh? A ton of us guys here in TN get together and cruise.
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Old 02-07-2015, 03:46 PM   #35
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Nova area

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