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Old 04-13-2015, 10:44 AM   #1
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X or H pipe!

I am going for a catless x or h pipe! I am not doing headers yet but that will be soon. I am going for either the Lethal Performance X pipe or the H pipe and I am curious on which pipe would be best for our V6 Mustangs. I currently have a Roush Axle Backs and Cold air intake and tuner and I am stuck on which pipe to go with. Any help is good! Thank You! Sound and performance is what I am looking for!
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Old 04-13-2015, 11:45 AM   #2
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Removing the cats & resonators will add a lot of rasp regardless of which x or h pipe.
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Old 04-13-2015, 11:47 AM   #3
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H pipe gives you the deeper throaty sound while the x pipe is louder and kind of like nascar sound. Seeing how you have Roush which are pretty loud I would get an H pipe. Otherwise you will have tons of rasp.
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Old 04-13-2015, 12:15 PM   #4
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Some rasp in a v8 is ok for me but I hate it in 4 and 6 cylinders.
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Old 04-13-2015, 02:09 PM   #5
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H pipe gives you the deeper throaty sound while the x pipe is louder and kind of like nascar sound. Seeing how you have Roush which are pretty loud I would get an H pipe. Otherwise you will have tons of rasp.
I think I am leaning towards the H pipe, I don't want it to be a higher pitch then it already is, i might add 18" resonators sometime or maybe not but the Roush exhaust is getting a little old and I want to change it up!
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Old 04-13-2015, 02:15 PM   #6
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I think I am leaning towards the H pipe, I don't want it to be a higher pitch then it already is, i might add 18" resonators sometime or maybe not but the Roush exhaust is getting a little old and I want to change it up!
Not to he rude or anything but an off road pipe with Roush mufflers on a 3.7 is going to sound raspy as all hell regardless of what you do. I really think it will sound horrible and you will hate it
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Old 04-14-2015, 01:43 PM   #7
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Bbk x pipe w/cats and bbk long tube with MBRP pro series axle backs??? How's that going to sound?? Lol


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Old 04-14-2015, 01:50 PM   #8
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Bbk x pipe w/cats and bbk long tube with MBRP pro series axle backs??? How's that going to sound?? Lol


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Longtubes just don't sound good on the cyclone
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Old 04-14-2015, 01:52 PM   #9
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Really what's the problem??


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Old 04-14-2015, 01:53 PM   #10
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Really what's the problem??


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They get raspy fast
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Old 04-14-2015, 01:59 PM   #11
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Even w/cats and mbrp's are pretty quiet mufflers!


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Old 04-14-2015, 04:38 PM   #12
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Even w/cats and mbrp's are pretty quiet mufflers!


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Here's Dave Youngs 2011 V6 with...
BBK long tube headers with BBK catted shorty X-Pipe and Magnaflow 'Street Series' axle back mufflers.


(recording quality not that great.)
EDIT: I believe the cats help a lot. I assume the resonators are gone.
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Old 04-14-2015, 05:10 PM   #13
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That doesn't sound bad. Nice
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Old 04-14-2015, 07:22 PM   #14
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Originally Posted by IanTheFancy1 View Post
I am going for a catless x or h pipe! I am not doing headers yet but that will be soon. I am going for either the Lethal Performance X pipe or the H pipe and I am curious on which pipe would be best for our V6 Mustangs. I currently have a Roush Axle Backs and Cold air intake and tuner and I am stuck on which pipe to go with. Any help is good! Thank You! Sound and performance is what I am looking for!
4. Midpipes: The Factory mid pipe is a Hybrid H/X pipe with 2 cats, and 2 resonators. Your aftermarket mid pipes will come in 1 of 2 configurations, either a dedicated X or H, with the option of cats or no cats typically.

X-pipe: It has been dyno tested that an X will make more power, however marginal it may be (typically 3-5 whp at best). Typically however, your X-pipe will induce a LOT more rasp, something someone may want to keep in mind when choosing their mods.

H-pipe: Again, as was said above the H-pipe will give up a few whp to the X-pipes, but the lack of rasp may be a little more what some folks are looking for.

Cats Vs Catless: Depending on how strict inspections are in your area, you may want to choose an aftermarket mid pipe option that includes High flow cats. High flow cats are an interesting topic, and one that is also highly debated, but i will include my personal opinion. The only reason cats are "high-flow" is because of the number of cells they have, the fewer the cells, the "higher flowing" it is. Well, if a cat flows enough, it can still register (as far as the computer is concerned) as "catless" and cause issues with emissions testing. Just food for thought. Personally, i would either go catless or stick with the factory pipe. I personally dont see the point in spending $500+ on a mid pipe that still has cats, but this is a decision you will have to make for yourself.
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Old 04-14-2015, 07:24 PM   #15
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Originally Posted by Diehard View Post
Here's Dave Youngs 2011 V6 with...
BBK long tube headers with BBK catted shorty X-Pipe and Magnaflow 'Street Series' axle back mufflers.


(recording quality not that great.)
EDIT: I believe the cats help a lot. I assume the resonators are gone.
Oh the MagStreets...they seam to make almost ANY exhaust on the 3.7 sound awesome...great vid...even better exhaust choice!
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Old 04-14-2015, 07:41 PM   #16
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Longtubes just don't sound good on the cyclone
Gonna have to respectfully disagree with you sir. I have long tubes on my 3.7 and love the sound.

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Old 04-14-2015, 08:06 PM   #17
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Well that's cool kona blue...like I said I have MBRP axle backs and there pretty quiet. Gotta believe it'll cancel out some rasp.


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Old 04-14-2015, 08:08 PM   #18
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Well that's cool kona blue...like I said I have MBRP axle backs and there pretty quiet. Gotta believe it'll cancel out some rasp.


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I have the Flowmaster Force II axle backs along with the off road x pipe as well.

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Old 04-14-2015, 09:11 PM   #19
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I have the Flowmaster Force II axle backs along with the off road x pipe as well.

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Just don't fit my taste at all on the 3.7. I liked them on the 4.0, but shorties just seem to give it a smoother tone.
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Old 04-14-2015, 09:36 PM   #20
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Just don't fit my taste at all on the 3.7. I liked them on the 4.0, but shorties just seem to give it a smoother tone.
The shorties could give it a smoother tone, I never had them. Lol.

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Old 04-14-2015, 10:02 PM   #21
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X or H pipe!

I have the exact same set up. It's very loud! After a couple 100 miles you get use to it and it tones down a bit. I get mixed reviews, some love it some hate it. At idle it is mistaken for a v8. I have multiple videos on my YouTube channel

http://youtu.be/ypT67U1s5mM



http://youtu.be/-sYJzK6sZxA


http://youtu.be/PKbYADRo8Yc

Let me know if you have any other questions.
Oh and you also get a very noticeable performance gain. You lose just a little low end torque but it moves to the higher end. I think BBK claims 20hp and you can definitely feel it!


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Old 04-15-2015, 09:54 AM   #22
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Smoother tone??? Lol...I'm all about the horse power. I'm not spending the money on shorties for tone. That's why I could have put on some real noisy axle backs ....but they add no hp! I put on quieter ones for the day I add the headers and x pipe. Which will add REAL HP!!


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Old 04-15-2015, 10:31 AM   #23
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Shorties will give you a nice bump in low end tq where our cars really need it as Lts will lose some down low.

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Old 04-15-2015, 10:47 AM   #24
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H pipe will Give you a deeper and throatier sound.
X pipe will give you a "racier" sound with some rasp if it is O/R.
X pipe will give you a HP increase . H pipe will not. O/R h pipe will give you a small increase in HP, O/R x will give you the greatest hp increase

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---------- Post added at 11:47 AM ---------- Previous post was at 11:47 AM ----------

I have BBK ceramic shorty headers with a Ford racing x pipe, love the gains and the sound. Best of both worlds IMO

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Old 04-15-2015, 02:20 PM   #25
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H pipe will Give you a deeper and throatier sound.
X pipe will give you a "racier" sound with some rasp if it is O/R.
X pipe will give you a HP increase . H pipe will not. O/R h pipe will give you a small increase in HP, O/R x will give you the greatest hp increase

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---------- Post added at 11:47 AM ---------- Previous post was at 11:47 AM ----------

I have BBK ceramic shorty headers with a Ford racing x pipe, love the gains and the sound. Best of both worlds IMO

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Uh Uh UH...hold on there you're 90% correct.

X pipes give such a small insignificant HP increase that it makes no difference if you get H or X for power as both give gains over stock (3-5 hp). They are mostly for sound.
Also removing the cats on ANY setup will give you a bump in peak HP but you will lose a little in the low end, but not much.
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Old 04-15-2015, 02:42 PM   #26
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Uh Uh UH...hold on there you're 90% correct.

X pipes give such a small insignificant HP increase that it makes no difference if you get H or X for power as both give gains over stock (3-5 hp). They are mostly for sound.
Also removing the cats on ANY setup will give you a bump in peak HP but you will lose a little in the low end, but not much.
Well we have a hybrid pipe on this car so either pipe is giving you basically nothing noticeable. On most cars the x will give you more than an h. I haven't dynoed or seen one with a catted H that's not the GT diameter so can't say for sure what the H would give you stock size and catted but the x will give u something

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Old 04-15-2015, 05:20 PM   #27
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Well we have a hybrid pipe on this car so either pipe is giving you basically nothing noticeable. On most cars the x will give you more than an h. I haven't dynoed or seen one with a catted H that's not the GT diameter so can't say for sure what the H would give you stock size and catted but the x will give u something

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This is true. However most the mid pipes sold for our cars are 2.5" The stock GT H is 2.5" at the cross and 2.75" after. Most believe the X gives big noticeable gains so they use it more than the H pipes also its hard to find an H pipe made for our cars. A lot are custom made or as in my case i recycled a GTs.
Sound is the more decisive factor for them though. The change is highly noticeable.
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Old 04-17-2015, 03:45 PM   #28
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I'm of the opinion, which I learned back with my 2 valve, that offroad midpipes should be paired with chambered mufflers to reduce the raspyness. If you're running a straight pipe/trumpet like design, catted midpipes are best.

But its all subjective.
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