H pipes are a must

[TLSTWIN]

Originally Posted by MadMaxx

Camaro come stuck w/ a X pipe bud, not H.

No "X", it's an "H". I can't seem to find any of my pictures I took of the actual "H"

[bballr4567]

The H is tiny though. If the exhaust is 2.5" then the H pipe is around 1-1.5".

[MTron]

Originally Posted by davidj

First off, my name is not Bud. Second, you better check your facts.

[FRKNlo]

H pipe, as you can see @ upper left of the pic. (dont mind the red circle)

Originally Posted by Z_Rocks

<snip>

[Jinx]

Originally Posted by radz282003

Well, I could swear I remember the SW and Borla systems having X-pipes matching the 3-inch fore and aft pipes. I think the Texas Speed one does to; I'd have to go look, but I'm sure most companies will come with bigger pipes.

Yeah, but its just x-pipes with the 3'' systems. I havent seen a H-pipe to match a 3'' system with the 5th gen. I think this is something that a small party is going to have to fix (like StolenFox did on the GTO forums). I believe he had weld-in and complete mid-pipes available in the h-pipe configuration.

[Jinx]

Originally Posted by Aperformance

H-pipes are just a buffer to help equalize the sound between the right and left banks of the engine and my experience has been that you will get a more muscle car sound using one compared to an x-pipe. All the x-pipe exhausts out there seem to be more exotic sounding on these modern V8's kind of Ferrari like... More trebble and less bass for sure... I've always liked the way side pipes sounded but never cared for the look maybe no crossover would really sound Bad A--, has anyone tried that?

The traditional H-pipe crossover allows some of the extra pressure to bleed over to the 'quiet side' of the exhaust system, resulting in some low and mid-range torque improvements. At high RPMs, however, in traditional exhaust systems, the gases cannot bleed across the H-pipe fast enough to help power significantly. Performance systems with the H pipe design, attempt to over come this by using a shorter cross over pipe which is also slightly larger in diameter as the main exhaust, then would be used in a standard exhaust.

To overcome the power loss of "over loading" the H pipe design, Exhaust manufacturers came up with the X pipe design, which features a tangentially Siamese crossover junction to synchronize exhaust pulses. The X-pipe concept is to split the flow in the crossover junction, so the pressures on both banks will be equal and pulse-free after the crossover, regardless of the rpm. Volumetric efficiency and power are therefore improved at all engine speeds. The negative aspect to the X pipe design is, because of the crisscrossing of the flow stream, harmonic pulsations will develop on some systems at certain RPMs, which will be perceived as a buzzing or humming sound.

Then to add to the debate and confusion to some people is the MAC Prochamber. It looks like inline chambered muffer where the 2 header leads enter one end and then exit the other in the location of the H or X pipe.
It is a combination of all 3 designs mentioned. It has crossover flow of an X pipe and the open buffer of an H pipe and the passive pulse control of a ported baffle channel pipe. MAC is the only one to have this design in production. I combined into one chamber box, where the 2 inlets extend into the box a few inches to prevent reversion and open dumping exhaust into the box. The outlets are flush with the back of the box and there is a baffle between the sides with ported slots directing the flow of the inlets to cross to the other side. The Box holds backpressure at a steady rate, which eliminates scavenging. Some people believe the Prochamber will give increased performance values. Everyone using them will tell you they make a deeper yet quieter tone to the exhaust note.

A newer concept is a "Channel Pipe", where as two pipes are welded together in parallel with a baffle in between them which allows for mismatched pressures and pulses to cross to the idle side while allowing full, uninterrupted or redirected flow of the exhaust stream through the system.

Then there is the V6 discussion about using crossovers since we atre on the subject. (even though this is the V8 discussion forum).

In the case of the V6, with their even firing order, having a crossover or not to have one, depends on the size of the exhaust piping and distance from the engine that the pipes are placed. A cross over is not required if the exhaust is tuned to the engine. Tuned systems are nearly always without a crossover pipe because the length and diameter of the exhaust is specifically designed to work with your engine at a specified RPM Range to avoid reversion and scavenging.

On a V6 there is no need for a crossover due to the even firing order engine. However, it has been proven that in some instances, a crossover pipe will decrease backpressure and allow for a higher flow. If the crossover pipe is too close to the engine, it allows the pulse timing of the opposing cylinders exhaust cycles, to crash into each other. Of course that is to say, the pressure from a right cylinder will still be present in the left pipe when the left cylinder opens to vent. Too far a placement can create a pulse vacuum, causing diminished pressure on the venting opposing cylinder, causing decrease in torque (Called Scavenging).

Correct design and placement of the cross over will allow a balance of pressures across the system and in increase torque, especially at lower RPM.
Also, it has been shown that having a cross over pipe mellows out the raspy ricer sound that occurs above 3000rpm. So some people install them just for the sound.

So, the bottom line is, you probably should have a cross over pipe on a V6 exhaust, even though it is not needed. There is minor performance gain and sound gain as well. That between you, your wallet, and your goals.

So when you say " H-pipes are just a buffer to help equalize the sound" isnt 100% true. On V8s there is a measure of performance to be affected between the two. As I mentioned, in my experience I know the advantage of the X-pipe, but its not much over when compared to a H-pipe correctly sized and tested. I like the "traditional" muscle car sound as well.

Just dont install a o-pipe, lol.
http://kalecoauto.com/index.php?main...&products_id=3

[GigaHz]

The 2004 GTO had that H pipe in it. When it was cut a part, there was no crossover. It was there for strengthing. The 2004 GTO had true duels.

[ducatisl]

Originally Posted by Jinx

...Just dont install a o-pipe, lol.
http://kalecoauto.com/index.php?main...&products_id=3

Not dig this out of the past, but the items at kalecoauto.com are hilarious! ...left-handed metric screwdriver...ha!

[v6sonoma]

If you want an H-pipe just buy an axel back. You already have one. Most aftermarket systems have an X-Pipe. I believe they flow better.

[SS Matt]

Originally Posted by MadMaxx

Camaro come stuck w/ a X pipe bud, not H.

False

[g-townmach]

JBA's catbacks use H-pipes. I currently have this system and it sounds great. http://www.latemodelrestoration.com/item/JBA-403114

You can also get Spintech's catback with an H or X.


X-pipe = higher pitch tone, about 5-8 more rwhp

H-pipe = deeper/bass-like tone, doesn't scavenge as good as an X from 3000 and up

[IROCanSS]

Holy thread resurection!

Originally Posted by davidj

First off, my name is not Bud. Second, you better check your facts.

LOL to this anyhow. 2010 Camaro... totally H pipe!

[axis]

Guys, you do realize this thread was brought back to life by a newb commenting on kalecoauto.com.

[AlSuwaidi]

x pipe for better flow even IF it doesnt sound better