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Old 02-25-2015, 05:59 AM   #1
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Exhaust experts, need your help.

I bought a used 2014 GT and have known I have some sort of aftermarket exhaust but didn't know exactly what I have until now.....I think.
At first I thought the previous owner had Pypes bomb axle backs but two large tubes, larger in diameter than the rest of the exhaust tubes in front of the axles was confusing me.
Now after seeing another thread, I think what I have is the Pypes M80 cat back.
Pypes Mid Muffler Super System Cat Back Exhaust for Ford Mustang GT 2011-2014 5.0L
It seems to replace the normal GT resonators with Pypes ones and the description says it eliminates the crackle and pop. Which it does. It's definetely louder than stock with no pop or crackle but isn't the sound I prefer, which is Roush.
I've had a set of Roush axle backs I purchased used and waiting to install when the weather is warmer.
What's going to happen here if I put my Roush axle backs on with the M80 mid mufflers?
I got a sick feeling it won't sound as good as the stock GT setup with Roush Axlebacks.
I had a previous 11 GT that was normal except for Roush Axlebacks and I want that same sound,
Any advice?
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Old 02-25-2015, 06:11 AM   #2
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I wouldn't consider myself an expert be any means more like another point of view. With that being said i ask if you like the current set up keep it if not cut it out and put in the set up you want.

It won't sound the same but if you can roll with it no harm done

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Old 02-25-2015, 06:20 AM   #3
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Also, if the solution is to find some used factory resonators and put them in, in place of the Pypes mid mufflers, is that a major deal or can they be welded in for not too much $?
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Old 02-25-2015, 11:05 AM   #4
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If you plan on putting the resonators back in I would look into the dynomax race bullets.
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Old 02-25-2015, 12:56 PM   #5
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What size inlet/ outlet?
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Old 02-25-2015, 01:00 PM   #6
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Dynomax race bullets and m-80s are the same thing pretty much I thought.

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Old 02-25-2015, 01:12 PM   #7
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I don't know, but pretty sure M80s is what I have and they're huge. The Pypes rear most part, the Pypes Bomb part looks just like a straight Axlebacks. And this thing is not any where near as loud as a normal factory GT with only Roush Axlebacks and the resonator intact.
The M80 seems like a muffler more than a resonator.
So essentially if I left the M80s on and put the Roush Axlebacks on, I would have two mufflers inline on each exhaust. Am I on the right track here or am I all confused? Would that dynomax race bullet give me the same results as a factory oem resonator?
I just don't want to cut them out all together, I've heard Roush ABs are too loud without a resonator.
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Old 02-25-2015, 01:26 PM   #8
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Quote:
Originally Posted by Waylap1 View Post
I don't know, but pretty sure M80s is what I have and they're huge. The Pypes rear most part, the Pypes Bomb part looks just like a straight Axlebacks. And this thing is not any where near as loud as a normal factory GT with only Roush Axlebacks and the resonator intact.
The M80 seems like a muffler more than a resonator.
So essentially if I left the M80s on and put the Roush Axlebacks on, I would have two mufflers inline on each exhaust. Am I on the right track here or am I all confused? Would that dynomax race bullet give me the same results as a factory oem resonator?
I just don't want to cut them out all together, I've heard Roush ABs are too loud without a resonator.
http://www.americanmuscle.com/pypes-...ck-1112gt.html

Is that what you have? Honestly I thought the m-80 and the Dynomax ones were just bullet style mufflers

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Old 02-25-2015, 02:35 PM   #9
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The rear most part, looks like what I have. The mid mufflers pictured look much bigger on mine, see in first post.
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Old 02-25-2015, 02:37 PM   #10
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Honestly I would put the Roush on and see how you like it and go from there. Maybe the m-80s will tame them a bit and make them sound good

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Old 02-25-2015, 02:50 PM   #11
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If I get the dynomax, what size do I order?
Would rather find someone's used fac tory resonators though.
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Old 02-25-2015, 03:19 PM   #12
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The stock are choked down to 2"ish get the dynomax that are 3".I'll look up the part # for the bullets.


24222 is the part #
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Old 02-25-2015, 04:20 PM   #13
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Quote:
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The stock are choked down to 2"ish get the dynomax that are 3".I'll look up the part # for the bullets.


24222 is the part #
Sweet! Thanks so much. I'll wait a few days to see if anyone wants to sell me their used factory resonators and if not, I'm ordering the ones you suggested. Found them on Summit Racing for about $90 a pair.
one more thing...how much you think a muffler shop charge to cut out the mid muffler and put the resonators in?
I hope not much, Im on a tight budget lately for heating costs! Stupid crazy Winter.
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Old 02-25-2015, 04:20 PM   #14
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Size doesn't matter too much because you are welding it in anyway. I would try to get an oem resonator as well

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Old 02-25-2015, 05:19 PM   #15
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Quote:
Originally Posted by Waylap1 View Post
Sweet! Thanks so much. I'll wait a few days to see if anyone wants to sell me their used factory resonators and if not, I'm ordering the ones you suggested. Found them on Summit Racing for about $90 a pair.

one more thing...how much you think a muffler shop charge to cut out the mid muffler and put the resonators in?

I hope not much, Im on a tight budget lately for heating costs! Stupid crazy Winter.

Cost me 50$ to get my resonators cut out and a pipe welded in their place, basically the same as you're asking.


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Old 02-25-2015, 05:21 PM   #16
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I paid $70. Just depends where you live I guess. But $50-80 does seem to be the range.
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Old 02-25-2015, 09:25 PM   #17
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I would just look for a used factory set. There is plenty of guys who have them sitting around. Where are you located?
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Old 02-25-2015, 11:22 PM   #18
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Don't waste ur time. On other resonators I've owned the m80 resonators/straight through muffler it'll tame the roushs down a little but also flows better than crimped stock ones. If u need more sound Cat deletes

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Old 02-26-2015, 12:42 AM   #19
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Can't do cat deletes, I'm in NH. Pretty strict here on vehicle inspections but I've been squeezed by on my loud exhausts before as long as I have cats and it "looks" like there's a muffler system. Roush axle backs are just right for me but I think without resonators of some kind, it would be too loud.
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Old 02-26-2015, 12:45 AM   #20
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Exhaust experts, need your help.

As long as they only check to see if the cats are on and not emissions, you can just hollow out the cats...
It isn't hard, I've done it several times...

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Old 02-26-2015, 08:57 AM   #21
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Keep the m80 and put roush. It'll sound good

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