H-Pipe or X-Pipe

[BIG KRIS]

Currently running 40series flos dumped in front of axle.What would i gain from adding h pipe or x pipe and which is better?

[gchemist]

An H pipe will balance flow. It will also reduce overall sound. An x pipe will scavage exhaust from each side. You have better flow. X pipe for performance. I drive one in my truck truck. Sound it awsome with with dual Magnaflows.

[J_PEPIN87]

Originally Posted by gchemist

An H pipe will balance flow. It will also reduce overall sound. An x pipe will scavage exhaust from each side. You have better flow. X pipe for performance. I drive one in my truck truck. Sound it awsome with with dual Magnaflows.

THIS IS THE SAME SETUP I PLAN RUNNING ON MY TRUCK ONCE I GET THE BIG BLOCK RUNNING.MINE WILL BE 3 IN.I PLAN ON USING THIS ONE WITH THE CUTOUTS SO I CAN OPEN THE EXHAUST AT THE TRACK.http://www.summitracing.com/parts/PYE-XVX13/

[Robertjust777]

I'm goimg to run the brand pypes x pipe and get electric cut outs

[chris mc bride]

I have simular plans for my 69 panel.It has 454 that Ive already purcahsed heads and stroker crank for. I plan to run large headers with 3 inch duals a x pipe ,but I will be running a merge collector and no cut outs. Right now the body work is about to bank rumpt me.

[AirMale]

any pics of under carriage w/ X or H pipes? I want to see how it's routed.

[Robertjust777]

x2

[mongoose]

x pipe... they sounds better imo..

but prob wont see a bunch of improvement power wise.

[chris mc bride]

actaully there good amount of power to be gained with properly done exhaust. It would be hard to fell in a 5000 to 6000 lb truck but then if you gain ten there and ten a cpl more places before long youve added 50 ponies. Another item to check into is a merge collector w/ the cone inside its cheap power that will not hurt fuel economy either.

[gchemist]

Here ya go:

[AirMale]

That probably won't fit under my truck. It seems to hang down a little more than I like.

[djracer]

its hard to get much more than an H pipe on a truck but I wouldn't have a street truck without one.

[1Bad62Pro/Street]

Originally Posted by BIG KRIS

Currently running 40series flos dumped in front of axle.What would i gain from adding h pipe or x pipe and which is better?

The h-pipe is used to help equal the back pressure on both sides of the exhaust

The x-pipe is the same but is much better at equalizing the pressure.

There's a big misconception about the intended function of the X-Pipe versus the H-Pipe.

The H-Pipe does balance out the pressures and slightly helps start the scavange effect on the next exhaust pulse. But it's most effective use when properly placed and sized is for it's tuning function. Sound waves enter the tube changing to a specific frequency that was found to be a problem. Prehaps a droaning noise at highway speeds. With the correct placement in the system and correct inside diameter, sound waves entering the tub shift to the problem frequency. When like frequencies collide, they cancel.

The power comes from opening up the exhaust. A slight add comes from the scavenge effect but ultimately the H-pipe is to counter the noise from opening up the exhaust.

The X-Pipe on the other hand is more effective in sound cancellation. By forcing the exhaust streams to collide, some sound frequencies are cancelled. (In a much larger range than the H-Pipe.) You would think the two exhaust paths colliding would cause more backpressure. In reality, the exhaust flow mass follows the path down the same side. (Bending around the inside of the X.)

The sound frequencies cross paths of the exhaust. Cancellation of like frequencies occur even though the mass of the exhaust flow hits and deflects into the same side pipe.

This is all assuming WOT condition or near full mass flow rate. At lower flow rate, the X-pipe does make the low frequency idle sound a little irratic. Something desireable in a Mustang or Corvette. But a Cadillac wouldn't care for it.

This is used as a band aid in tuning high performance vehicles to meet the legal pass-by requirements. Something that is difficult to do on a car like the Viper Roadster or Corvette.

The X-pipe idea was tried on the Viper roadster but ultimately they used the H-pipe design. If you've ever seen the OE system on a Viper Roadster, the exhaust exits the headers, enters an un-Godly hot converter that I have seen damage body panels and melt basalt packing back into a crystal solid. It runs down the side of the car into the main muffler and then to the rear axle. Then it turns to the opposite side and hits the H-pipe which is over the axle and exits out before the axle on the opposite side of the car. If it were not for the Pass-By requirements, this would be an easy design.

Designs like this and the birth of the X-pipe all stem from the need to meet the requirement. Again, the X-pipe just allows the exhaust to be opened up more while tuning out undesireable frequencies. It's ability to "add" power is a debate most drawn up by aftermarket marketing managers. Everyone loves a gadget.

[BIG KRIS]

Thanks!

[1Bad62Pro/Street]

Dont forget bud you can always make your exhaust if you have the means to.
I have not done it on my truck yet....
But my exhaust is home made....

http://www.jegs.com/webapp/wcs/store...ance+Pipe+Kits

http://www.jegs.com/webapp/wcs/store...rm=X-Pipe+Kits

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