X pipe or H pipe, again

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71Scamper

Mopar runs thru my veins!
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I'm having a tuff decision on what to get. I was originally going to order a custom stainless H pipe from TTI, but all my buddies are giving me sh*t saying the X pipe will give more power. Now I've never personally done any testing to prove it out, but from what I read in many places theres not much difference in performance. It seems sound is the main difference. Does anybody have any first hand experience on performance from X to H pipes?
 
conventional thinking is that the X has easier flow therefor produces more power.. I have had both but the cars were not equal so.... apples to oranges. I will say this, I prefer the X.
 
I think the x is a little better but unless you're looking for peak dyno numbers I'm not sure you'll really notice. This is my experience with them on fox body mustangs anyway.
 
I like the sound of the X better.If it makes more power then great.If it doesn't then I still like the sound better.
I do believe the X needs to be placed as close to the collectors as possible for any scavenging effect to be beneficial.
 
See - X pipe H pipe or side by side

In short:
H pipe - Lower end torque/power, deeper sound. The pulses will "run" into each other in the pipe. Helping reducing resonance. Think old school V8.

X pipe - High end gains. More horsepower overall. The pulses will "merge" better in the pipe. Causing a scavenging effect at higher RPMs. Think raspy newer high performance engines.

As you can see, some agree to disagree. But in the end. That's how it works out.
 
That topic on the link you posted has to be the most painful one to read through.
I made it to page 2 before I couldn't take it anymore.
Think I'm gonna see my dentist and have him randomly pull some teeth and have his assistant do a root-canal at the same time... But I'm not quite sure yet it will 'top' that topic!

:)
 
..this argument will go on forever.
Just read Rusty Rat Rod's guide to Hot Rod Bliss and build your car using logic.
 
..this argument will go on forever.
Just read Rusty Rat Rod's guide to Hot Rod Bliss and build your car using logic.
no need for either one of them if you build a high performance dual exh. system that`s big, "on a big engines," my opinion is that they are for little motors that need help.
 
This could get debated till we're all blue in the face. But I will say from my experience, when we changed the H pipe to an X pipe on my sister's Mustang years ago, the car pulled harder in the top end and sounded better in the top end as well. I think that the H pipe sounds better than the X at idle and lower rpm though. I've always seen that the X usually comes out a little ahead in power overall over the H when tested side by side. But that may also depend on what the combination is. Here's the X on my car with UltraFlo's

 
All good info, thanks! I decided to go with an H-pipe. I'm having TTI make em up custom out of 304 stainless.
 
I have heard so many times the H and X have been proven to increase power.
...can anyone show me a test that proves this,made by someone not in the retail business.
 
I have heard so many times the H and X have been proven to increase power.
...can anyone show me a test that proves this,made by someone not in the retail business.

Look at every nascar car, every single one runs an x pipe. Trust me. It's not there for show.
 
Look at every nascar car, every single one runs an x pipe. Trust me. It's not there for show.

Because Nascar engines are constantly running in the upper RPM range the x pipe makes more power for them.

My setup will benefit more from an H-pipe. I guess you could say the decision would be based off the engine build and purpose of the vehicle.
 
Because Nascar engines are constantly running in the upper RPM range the x pipe makes more power for them.

My setup will benefit more from an H-pipe. I guess you could say the decision would be based off the engine build and purpose of the vehicle.

That was my point. Nascar wouldn't put them on there if it didn't improve power.

Like I said before, I would run an H pipe on the street. For better low end power and torque. X pipes are for 7k+ rpm race cars, in my opinion.
 
oh boy..lots of back and forth info..maybe they do make power ..maybe they don't?
Nascar engines...358 ci, 850 hp / 10,000 rpm open headers...noise reduction or more power?

"go ahead if you want to, but an H or X is a total waste of time" ...Joe Sherman Racing Engines

"We have dynode many and there has never been an increase in Hp with an H or X,but some
did have a reduction in power"...J.Klein,Packard Engineering
 
Let's hope "Engine Masters" do a comparison on of their shows. They set stuff up against each other on the dyno all the time.
 
Let's hope "Engine Masters" do a comparison on of their shows. They set stuff up against each other on the dyno all the time.

That would be the true test to see an actual comparison. But I feel it needs to done on 2 different engines that have been built for different rpm ranges. One that is made for say a max rpm of 6k, low to mid power band, and another with a max of say 7500, mid to high rpm power band.
 
That would be the true test to see an actual comparison. But I feel it needs to done on 2 different engines that have been built for different rpm ranges. One that is made for say a max rpm of 6k, low to mid power band, and another with a max of say 7500, mid to high rpm power band.

..engine masters would be paid by advertisers.
 
I didnt read all the replies, but I would say neither. If an X or an H pipe makes the car faster, you have other issues.
 
why don't you just do both?
put in X pipe in near the transmission cross member, and add an H pipe near the rear axle
:poke:
 
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