H pipe vs x pipe - Ford Mustang Forum
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post #1 of 16 (permalink) Old 04-28-2011 Thread Starter
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H pipe vs x pipe

Im not really a grease monkey but ive always wanted to be. was informed to do something else with my life and keep the grease monkey business as a hobby. so pardon my ignorance.

What is the difference between H pipes and X pipes. why wouldn't you just run them (the pipes) straight to the back of the car. seems like it would have less bends and be more free flowing. or am i totally missing something about exhaust that i know nothing about???

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post #2 of 16 (permalink) Old 04-28-2011
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Well you need to retain backpressure with an exhaust system. The h or x pipe is where the cats are for emissions and the crossing section be it an h or an x is an equalizer. Iv read posts that say x is better but the speed shop I go to says it makes little difference really. More than anythying you might get a different sound. That's about all I know.
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post #3 of 16 (permalink) Old 04-28-2011
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The H loses its tone after so many RPMS, sounds like divorced pipes
...but the X doesn't...

Plus is H is for me equalizing, sixer don't require that...even firing.

Ive ran around asking shop around me, and they are saying the X is the way to go. "X is the new H" is you will lol...

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I ran just straight pipes to my exhaust and liked it but wanted more, and the X pipe did that.
my 0.02...

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post #4 of 16 (permalink) Old 04-28-2011
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I prefer H pipes.
The sound diference is that an H pipe has a deeper, muscle car sound. And the X pipe is raspier. Ive used both and defintily like the H. But it is personal preference really. I think you might get like 2hp more with an X pipe over an H pipe. But the deeper rumble of an H pipe out weights that minor hp gain to me.

And yes the purpose of the pipes is for back pressure.

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post #5 of 16 (permalink) Old 04-28-2011
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This topic came up a few months ago on this exact forum I believe. Someone provided a link to a study performed on some muscle cars and found that the pressures and air turbulence of the x-pipe helped to increase power over h-pipes but h-pipes are typically less expensive since it's just a straight pipe between the two exhausts. So you can save some money by going with h-pipes while still getting the benefit of pressure equalization, backpressure etc, but it won't be quite as good as an x-pipe design.
post #6 of 16 (permalink) Old 04-28-2011
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You guys can't equate the benefits of "X" and "H" pipes for a V8 car to a V6 because the V6 firing order is such that it can't take advantage of the exhaust pulse tuning like a V8.

On a V6 they are only any good for sound tuning.
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post #7 of 16 (permalink) Old 04-28-2011
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Quote:
Originally Posted by Ltngdrvr View Post
You guys can't equate the benefits of "X" and "H" pipes for a V8 car to a V6 because the V6 firing order is such that it can't take advantage of the exhaust pulse tuning like a V8.

On a V6 they are only any good for sound tuning.

So, you are saying that the only reason Ford put the X pipe on the 3.7 is for "sound" I'm sorry but I'm not buying it......It has alot more to do with motor performance than just sound, a lot more............Plum
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post #8 of 16 (permalink) Old 04-29-2011
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Quote:
Originally Posted by Plumbago View Post
So, you are saying that the only reason Ford put the X pipe on the 3.7 is for "sound" I'm sorry but I'm not buying it......It has alot more to do with motor performance than just sound, a lot more............Plum

Believe what you will, x-pipe on a V6 does nothing for power but a lot for souind.
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post #9 of 16 (permalink) Old 06-01-2012
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Quote:
Originally Posted by Ltngdrvr View Post
Believe what you will, x-pipe on a V6 does nothing for power but a lot for souind.
I have an x pipe, it added a few horses at the top end. It does make a difference in sound but I definitely notice a difference.
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Quote:
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Believe what you will, x-pipe on a V6 does nothing for power but a lot for souind.
How can you say switching to a x/h esp without cats doesn't allow for more power?? Lethal performance actually dyno'd there v6 with their x-pipe..according to them saw 14-16 whp. Now even if that wasn't 100% accurate I'm sure there would still be gains. People haven't been deleting there cats for nothing, there wouldn't be such a mod. If your talking about the cut and clamp type pipes, that go after the cats then you might be correct.

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Quote:
Originally Posted by GRABBER3.7L View Post
How can you say switching to a x/h esp without cats doesn't allow for more power?? Lethal performance actually dyno'd there v6 with their x-pipe..according to them saw 14-16 whp. Now even if that wasn't 100% accurate I'm sure there would still be gains. People haven't been deleting there cats for nothing, there wouldn't be such a mod. If your talking about the cut and clamp type pipes, that go after the cats then you might be correct.
Whether it is an "x" or "H" pipe has nothing to do with the cats, deleted or not.

The 2011+ V6 comes with an "X" pipe from the factory, all you are doing with the lethal pipe is removing the cats and increasing the pipe diameter, that is where the power, if any, comes from.

The power in the V6 doesn't come from the "X" or "H" configuration, only sound change.

Like I said, believe what you want, or go out and buy all the stuff and do some back-to-back dyno testing.

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GRABBER3.7L, have you installed your Lethal H Pipe yet? I have one on order for next Wednesday arrival. I was wondering if you have any clips with your FRPP's.

Ltngdrvr, To be honest, I was hoping for some gains on the HP, but I'm really after a deeper more aggressive sound. That's why i went with the Lethal H pipe. As you said for sound wise, I hope it changes the sound from the stock x pipe.

Next for me is DS and 3.73 gears (3.31 is alright for now). Can't wait until next week for my Lethal H Pipe!!

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Currently running neither. Factory X removed. Sounds a bit better (lower tone, barely any typical V6 rasp at all) but I have custom exits, so that effects the sound as well. Will be having an H pipe grafted in eventually, to see if it lowers the pitch a little more.

H pipe: a little lower, more "classic" sound, if you will

X pip: higher, more exotic sound

My best approximation, anyway. HP/TQ differences not worth a hill of beans, unless you are running catless. Even so, not sure it makes a whole lot of difference without headers.
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Quote:
Originally Posted by mtu245 View Post
GRABBER3.7L, have you installed your Lethal H Pipe yet? I have one on order for next Wednesday arrival. I was wondering if you have any clips with your FRPP's.

Ltngdrvr, To be honest, I was hoping for some gains on the HP, but I'm really after a deeper more aggressive sound. That's why i went with the Lethal H pipe. As you said for sound wise, I hope it changes the sound from the stock x pipe.

Next for me is DS and 3.73 gears (3.31 is alright for now). Can't wait until next week for my Lethal H Pipe!!
I also would like to hear the h-pipe with the sports. Grabber, it seems like forever ago you mentioned the h in a thread. Hopefully, you'll do a soundclip soon. The world awaits the awesomeness.

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Quote:
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I also would like to hear the h-pipe with the sports. Grabber, it seems like forever ago you mentioned the h in a thread. Hopefully, you'll do a soundclip soon. The world awaits the awesomeness.
Sorry guys!! Been busy with work and such..do have a few clips! and some I do have to edit..I can write a review in the meantime but I'm leaving for vacation later tonight ahh

I will try to do it ASAP sorry for the wait!

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