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Old 07-14-2016, 07:45 AM   #1
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Exhaust question

This is my build:

2014 3.7L V6 (3.55 gears)

Airaid Cold Air Intake
BBK 73mm
BBK Shorty Headers
Roush Axle Back Exhaust

Bama 93 Race Tune

-------

Question:

How much benefit is the Roush AB giving me and any idea what effect returning to stock exhaust on performance?

Also would I gain much sound difference with the other mods to make the stock more enjoyable?

Love the sound at idle and slowly cruising around but since the gear swap I'm running higher rpms so I'd like it more quiet.

If returning to stock isn't suggested what are the tamer exhausts that I should research?

Borla Touring?

Thanx


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Old 07-14-2016, 09:54 AM   #2
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A lot of Roush axleback mufflers are sold for being too loud after headers are installed.

I have some Magnaflow competition (straight pipes), i notice a loss of low end power when i run them for a week or two a year. I tested just for fun, after i removed the competitions, i installed the factory mufflers, sounded like crap and still noticed a loss of low end torque. I then installed my Magnaflow street series axlebacks, my low end torque was back and life was perfect


I have long tube headers with a shorty catted x-pipe.....
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Old 07-14-2016, 10:47 AM   #3
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Actually the Roush sounded better after the headers. It's the higher rpms due to the gear swap that makes it louder than usual. Now I've head longtime a make it sound worse but the shortly gave it a deeper tone.


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Old 07-14-2016, 03:06 PM   #4
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You will notice no difference in performance if you remove your Roush and go back to your stockers.

Now when you say your running higher Rpms since your gear swap and would like something quieter I'm assuming you mean when your on the highway? If so I think you might be referring to drone?


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Old 07-14-2016, 03:50 PM   #5
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No real drone. It's just the screaming exhaust at WOT or a semi hard launch. I just find myself shifting higher revs than before.

It's getting better as time goes. Basically I'm relearning the shift points again.

Guess I'm wanting to not attract too much attention while I enjoy my new gears.


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Old 07-14-2016, 05:08 PM   #6
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Borla Touring, mine sounds awesome
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Old 07-14-2016, 07:58 PM   #7
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yeah i just got touring, and i enjoy the sound on a stock system. I bet it's sound great with headers and stuff!

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Old 07-14-2016, 09:31 PM   #8
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Based off some manufacturer claims ( if they are to be believe) I would say anywhere between 3-7 hp/tq for axleback performance gains could be lost. Maybe more maybe less lol
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Old 07-15-2016, 04:48 AM   #9
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Yes just like their Cai claims that have been proven inaccurate.
There are no gains by replacing just axel backs.
Doesn't a throttle body spacer increase performance as claimed by the manufacturer also lol.
What's next 3m gt 500 stripes give you more power, at least 2-3 hp per stripe?


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Old 07-15-2016, 08:15 AM   #10
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At least I don't have a throttle body spacer lol. Looked into them and did some research and finally decided wasn't worth the $100 for a little whirling sound lol.

I was mostly worried about a little more restriction going back to stock but it's starting to grow on me so I might leave it or just swap them one day and test it and go back if I'm not happy with the sound.


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Old 07-15-2016, 10:04 AM   #11
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Quote:
Originally Posted by FastFord13 View Post
There are no gains by replacing just axel backs.
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I'm curious how did you come to that conclusion?
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Old 07-15-2016, 10:04 AM   #12
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Quote:
Originally Posted by wmschoonover View Post
It's just the screaming exhaust at WOT...........Guess I'm wanting to not attract too much attention .


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so you like it but don't want to attract too much attention.....I'll give you a hint: avoid WOT (unless you are looking for attention).

That was easy!
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Old 07-15-2016, 01:05 PM   #13
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Quote:
Originally Posted by Strange Mud View Post
so you like it but don't want to attract too much attention.....I'll give you a hint: avoid WOT (unless you are looking for attention).

That was easy!

Easier said then done lol

Figure I'll take it easy... For now lol


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Old 07-15-2016, 01:13 PM   #14
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Quote:
Originally Posted by Slick953 View Post
I'm curious how did you come to that conclusion?
I did not come to that conclusion alone, it's well documented. Do a quick search either here or on Google.



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Old 07-15-2016, 01:17 PM   #15
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Quote:
Originally Posted by wmschoonover View Post
Easier said then done lol

Figure I'll take it easy... For now lol


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I hear you. Most of the time I love going wot with my Roush abs, but sometimes I'd like it a little quieter so I don't atract so much attention.

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Old 07-15-2016, 01:22 PM   #16
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Quote:
Originally Posted by FastFord13 View Post
I hear you. Most of the time I love going wot with my Roush abs, but sometimes I'd like it a little quieter so I don't atract so much attention.

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That's why I'd love one of the Roush exhausts I've seen on the newer mustangs. They have a control knob inside the cabin to adjust between 4 stages of exhaust. Quiet to screaming loud. Closest I've seen to that is the Varitune exhaust but you have to manually adjust and I've only seen them for V8's.


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Old 07-15-2016, 01:34 PM   #17
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Quote:
Originally Posted by FastFord13 View Post
I did not come to that conclusion alone, it's well documented. Do a quick search either here or on Google.



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Idk about well documented, this seems like one of those things people say but cant prove. In fact I've seen the opposite to be true so I'd be interested in said"document" if this is indeed true.
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Old 07-15-2016, 03:30 PM   #18
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If you want to increase power from your exhaust start by removing your cats.

Do you also believe there are gains by "upgrading" to a after market Cai as marketed by the manufactors?

When selecting an after market axel back go with the one that sounds the best to you, not with the excepectation of hp/tq numbers. If you do you'll be disappointed.


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Old 07-15-2016, 04:57 PM   #19
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Quote:
Originally Posted by FastFord13 View Post
If you want to increase power from your exhaust start by removing your cats.
Lol I kind of already have a full exhaust but thanks for the advice.

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Do you also believe there are gains by "upgrading" to a after market Cai as marketed by the manufactors?
I don't believe everything a manufacturer says but same can be said from what every forum member says.


What I have seen is a CAI dyno from american muscle of before and after and receive 5-10hp if I remember correctly. I've also seen other dynos show some sort of gain and then have seen people argue till they are blue in the face about whether those gains are legit or not. However, what I have not seen is mass amounts of people pop one on a dyno and receive none.
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Old 07-15-2016, 05:29 PM   #20
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Quote:
Originally Posted by Slick953 View Post
Lol I kind of already have a full exhaust but thanks for the advice.


I don't believe everything a manufacturer says but same can be said from what every forum member says.


What I have seen is a CAI dyno from american muscle of before and after and receive 5-10hp if I remember correctly. I've also seen other dynos show some sort of gain and then have seen people argue till they are blue in the face about whether those gains are legit or not. However, what I have not seen is mass amounts of people pop one on a dyno and receive none.
What is your exhaust set up?

I'm running headers and Roush axel backs and can tell you there was absolutely no performance difference between my stock axel backs and when I put my Roush on.
To dive a little further into the theory, going from a so called "restrictive" factory axel back to a straight through design like Roush with virtually no restricksion whatsoever should have made some noticeable difference in performance if the vendors claims were accurate.

The aftermarket Cai is another great example of cleaver marketing and is in theory actually LESS of a cold air intake as the true Cai that comes from the factory, as it is a completly sealed box and provides more then enough airflow to our N/A engines.
Again they got me suckered in to buying one thinking I was getting an upgraded part for my car.
When I had my stock airbox the inlet ambeint air temperature was ALWAYS much lower the my Airaid Cai, especially driving at low speeds around town, and in traffic there was a ridiculous difference between the two, why, because it's breathing in all that yummy hot air my chrome plated headers are producing because it's not a sealed box.
Just my 2 cents.


As for the American Muscle dyno I'm sure they will post a video of how a throttle body spacer increased hp, again your looking at stuff that a vendor sells and will do whatever they came to sell their products.
I love AM and buy just about all my stuff from them but you have to remember they are in the business of selling aftermarket parts and will market whatever they can to remain in business.



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Old 07-15-2016, 05:45 PM   #21
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http://www.bbkperformance.com/produc...mufflers-.html

Might look into how much work piecing one together would be. Just wish it was motorized but I'm sure it could be modified easily to be able to do that. Just add a gear and a small motor.

They actually make a bolt on kit for the V8 but not for the V6 but as you can see in the site I posted, it's for all models. I even found some listed for V6 or V8 Camaro's.

To get a 2015+ Roush setup like I discussed earlier is outrageous unless I could find it somewhere else.


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Old 07-15-2016, 05:52 PM   #22
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Nice idea! It would give you control that for sure.
Your thread got me looking around at different exhaust set ups as I've been running my current ome for over 3 years now and stumbled on this one. I love the sound of both the x and h......well maybe the h a tad more. What do you think.
https://youtu.be/E9Pb4g4bMx4

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Old 07-15-2016, 06:19 PM   #23
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Quote:
Originally Posted by FastFord13 View Post
What is your exhaust set up?
ST Hooker headers & catted Xpipe, with dynomax catback exhaust ( attached picture XD)

Quote:
Originally Posted by FastFord13 View Post
I'm running headers and Roush axel backs and can tell you there was absolutely no performance difference between my stock axel backs and when I put my Roush on.
To dive a little further into the theory, going from a so called "restrictive" factory axel back to a straight through design like Roush with virtually no restricksion whatsoever should have made some noticeable difference in performance if the vendors claims were accurate.
I believe most axlebacks for our models claim between 2-8hp and from what I read you generally cant tell a change from the butt dyno. Once you get to 15-20 thats a whole different story.

Quote:
Originally Posted by FastFord13 View Post
As for the American Muscle dyno I'm sure they will post a video of how a throttle body spacer increased hp, again your looking at stuff that a vendor sells and will do whatever they came to sell their products.
I love AM and buy just about all my stuff from them but you have to remember they are in the business of selling aftermarket parts and will market whatever they can to remain in business.
I think I stated I saw both mfgt and some independent dynos and both showed gains. I can go as far as to say some may exaggerate on their claims but I find it hard to believe multiple mgfts and some people all got together to collude about something such as whether they gained anything or not. Granted once again there are some folks out there like that however, I just cant believe all of them are.



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Old 07-15-2016, 06:33 PM   #24
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Honestly in that video, especially the last comparison.. they sounded very similar. But I do prefer the H-pipe and like it stated in the video, I've heard it's the least raspy pipe.

Found the Roush adjustable kit for the 2015+ on AM but only for the GT and it's only...

$2659.99 LOL

Roush Mustang Quad Tip Active Exhaust Kit 421927 (15-16 GT) - Free Shipping
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Old 09-01-2016, 12:16 PM   #25
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from a sound perspective the borla touring is awesome. it is deep sounding but not obnoxious
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