[jackhammer505]

What is a prochamber? is it like an x pipe or h pipe design?
Anybody know how its suppose to work?

[mynameismike65]

They call them prochamber- H pipes. Its just a box welded in where the gases mix/equalize. I guess its supposed to be the best flowing/designed midpipe. It also tones the sound down just a bit and cleans it up. I love the sound of my pc + the Mac mufflers. Sounds sooooooo good. Here is a pic of what the inside of the box looks like.

[mynameismike65]

Get the pc.....trust me, great quality/sound. Its more then the pypes H but IMO you get what you pay for.

[jackhammer505]

So the pic shows the exit and it looks like its not really connected to the inlet right?
the inlets look like they are coming in straight and the outlet pipes are pointed at the opposite inlet pipe or am i seeing things.

[07stanggt]

Its suppose to create something like a scavenging affect. the gasses fill up in the box and heat builds which makes it travel faster. Doesnt make sense. slow it down to speed it up but maybe someone smarter can understand and explain it better.

x pipe is going to flow freer. but the a benifit would be, x pipe performance, h pipe sound.

[07stanggt]

Originally Posted by jackhammer505 So the pic shows the exit and it looks like its not really connected to the inlet right? the inlets look like they are coming in straight and the outlet pipes are pointed at the opposite inlet pipe or am i seeing things.

No its not connected just two holes on each side.

[unlicensed to drive]

I think the prochamber is in between the x and h, it's for sound and performance right?

[nmcgrawj]

Originally Posted by 07stanggt Its suppose to create something like a scavenging affect. the gasses fill up in the box and heat builds which makes it travel faster. Doesnt make sense. slow it down to speed it up but maybe someone smarter can understand and explain it better. x pipe is going to flow freer. but the a benifit would be, x pipe performance, h pipe sound.

That depends on the shape of the x-crossover. Its easy to mess up an x-pipe design....not so easy to mess up an h-pipe. Plus, flowing "freer" is crashing two flows together at an angle? And some xpipes arnt even a straight shot through the crossover! coughbbkcoughbassanicough The flow is directed into a wall...


George Klass from Accufab who does designs custom headers has done multiple testing.....his recommendation? H-pipes.

I wish that I had saved all of the printouts but in general, it went like this. A 3" cross-over between 3" pipes seemed to work the best. The MAC type of box was about the same. The X-Pipe was always a little less. The guy that builds the headers for Dale Earnhardt Inc. (Accufab supplies DEI with brake caliper mounts, etc.) told me that a short H seemed to work the best for them especially on the big ovals. I think that that is what we can see in the photo of the upside down NASCAR car, a short (less than 3") connector between the pipes, but not a true X.

of which he was referring to this picture that was posted in a thread on hardcore50....






Yea this thread is old, but hey, spreading good info is never a bad thing

[07stanggt]

LOL. Rock on. So i was spreading bad information about x pipes being better huh?

Im honered that your second post was clearing this up. Now I know, so how much could I gain with something other then my x pipe? I might hit 400 again boys.

And I cant see anything in your picture, it looks like a type of x to me. And if DEI is running H pipes maybe thats why that boy hasnt won a race in years.

[07stanggt]

I agree with you on BBK and Bassani's x pipes. Which is why i run coughkookscough.


Let me get this straight, your qoute says that a H pipe and prochamber works about the same and a x pipe is less? That is a qoute from accufab that makes headers for DEI?

Total BS from anything I have ever read, seen, heard, or first hand tested myself with my car with a H and X pipe. Thats just my personal opinon though.

Welcome to the forum and at least you posted up some cool shit to argue about.

[Anthony05GT]

I've always had the understanding that X-pipes yield maybe 3-4 more top end hp than H-pipes, but the torque is higher on an H set up. Also, overall low end power is greater with an H which includes hp and tq. Here's a handful of links for you guys to look over. I don't see where there can be that much of a difference to talk about in the overall picture other than which sound you may prefer or which set up yields more power in your particular application which I would think varies from set up to set up.

P32980 Image Large Photo

Dyno Results: X pipe over Y pipe

C5 X Pipe Install - Tech Articles - Vette Magazine

From what I see, an X-pipe set up will in theory make more power as long as the rest of the exhaust system is matched just right to the engine's particular modifications. In real world situations it comes down to sound preference. On the Nascar track or competing for hundredths of seconds on the drag strip I can see where a the minimal gains could help you edge out the other guy.

[07stanggt]

And when you are racing are you in the 6000 rpm range or the 2000 rpm range? (rhetorical)

I refer back to a another thread. If you want to know what works ask the people winning races or running times you think are good times.

Ask JPC, JDM, Vinny Barber, Ford racing what crossover is on their car. I bet 10 bucks payable via paypal its a x pipe and I doubt they all did it becuase they prefer the sound.

So my comment stands. X pipe is better. No one said its a 20hp gain. But to say its 3 hp accross the board is incorrect as well. Exhuast gains will increase based on the HP of an engine. A 500hp engine will probably gain more from a exhuast or intake modification then a 300hp engine.

/ thread

[DiMora]

Those tubes on the prochamber actually extend into the box a bit - and they are staggered as that other picture shows. There is definitely some thought that went into the design - it is not just a "box".

They also make one to run the factory cats. I run one with Borla Stingers (Roush Off road exhaust):

[DiMora]

Originally Posted by 07stanggt Its suppose to create something like a scavenging affect. the gasses fill up in the box and heat builds which makes it travel faster. Doesnt make sense. slow it down to speed it up but maybe someone smarter can understand and explain it better. x pipe is going to flow freer. but the a benifit would be, x pipe performance, h pipe sound.

Perhaps there is a venturi principle being employed that works because of the timing of the exhaust pulses. If you have a pipe of a given diameter, and then you restrict that pipe then allow it to expand back out again, the velocity of the air in the restricted area will increase and the pressure will actually decrease (like when you partially kink a garden hose and hear that water hissing past the kink). Anyway, just a theory.

[03_StangGuy]

Originally Posted by DiMora Perhaps there is a venturi principle being employed that works because of the timing of the exhaust pulses. If you have a pipe of a given diameter, and then you restrict that pipe then allow it to expand back out again, the velocity of the air in the restricted area will increase and the pressure will actually decrease (like when you partially kink a garden hose and hear that water hissing past the kink). Anyway, just a theory.

Theory is sound but the PC is the opposite. The "chamber" is larger and would slow the air in the middle. There definately has to be scavaging with a big open space like that. Personally I just love the sound it produces. Deep but quite at low speeds and SCREAMS at WOT!

[Anthony05GT]

One thing's for sure, all of the fastest cars on the tracks do have X-pipes from what I've seen in recent years, because when matched up properly they do the job a little better, so there's no need to place any bets. For the average street guy who's not worried about a few hp, but prefer a deeper old school tone I'd hate to see them buy an X-pipe then cry about the raspy sound. Also, most driving is done on the street and not at 6000 rpm's. I would say that most guys reading this spend most of their driving time in traffic. The X-pipes have a distinct tonal difference that's unmistakable. Some guys like it and some don't. I have heard X-pipes that I do like the sound, but more often I personally do not.

[06VistaGT]

the prochamber has an amazing sound, very deep, but an X-pipe is more efficient overall.

[101fng]

why are people gettin so butt hurt about mid-pipes? aren't there more important things in life? like poontang?

[1FastFox]

A prochamber isnt an X or an H, its classified on it own... I have had prochambers on all my mustangs as I love the tone, but the X will out perform it ( not by a ton though ).

[PiggySmallz]

I never raced my GT when I owned it...however I had an O/R prochamber on it paired with borla stingers that got compliments EVERYWHERE and thats all that mattered to me lol