H-pipe vs X-pipe

A.Yeu

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Feb 9, 1998, 3:00:00 AM2/9/98

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Recently I've heard people talking a little bit about the new X-pipes
that have hit the market.

What are the major differences between the old H-pipe with no cats and
an X-pipe with no cats?

What manufacturers have X-pipes for 96+ GTs? Is any performance data
available on them yet?

I also heard there are some differences in exhaust sound. Can anyone
who has an x-pipe confirm this?

SEEverist

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Feb 9, 1998, 3:00:00 AM2/9/98

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A. Yeu wrote:

>Recently I've heard people talking a little bit about the new X-pipes
>that have hit the market.
>
>What are the major differences between the old H-pipe with no cats and
>an X-pipe with no cats?

I too am interested in these X pipes. Depending on what I settle on for a toy,
I may go this route. The theory, to the best of my knowledge, on the X pipe is
that it merges the exhaust gases from both sides instead of waiting for
backpressure from the mufflers to "force" an equal state between the two sides.
This is supposed to help in the area of exhaust scavenging too, due to the
unequal pulses of exhaust as a result of sequence of the left and right bank's
exhaust. This is where it gets confusing. It has to do with the fact that the
firing order doesn't go left bank, right bank, left bank, right bank, etc...

>I also heard there are some differences in exhaust sound. Can anyone
>who has an x-pipe confirm this?

I haven't heard a car with one of these yet, but it is supposed to be
different. It has to do with the evening of exhaust pulses mentioned earlier.
There will be a more constant flow of exhaust through the mufflers and out the
tailpipe. I'm curious how this would sound with a pretty big cam that has a
lot of lope to it.

Hopefully someone has more technical information on these, and a place they can
be obtained. I'd like to try them in my next car too.

Steve
Current head of the bashing department for rec.autos.makers.ford.mustang:
"Weekend pass people" mode is ON!!

Roger White

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Feb 9, 1998, 3:00:00 AM2/9/98

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SEEverist wrote:
>
> A. Yeu wrote:
>
> >Recently I've heard people talking a little bit about the new X-pipes
> >that have hit the market.
> >
> >What are the major differences between the old H-pipe with no cats and
> >an X-pipe with no cats?
>
> I too am interested in these X pipes. Depending on what I settle on for a toy,
> I may go this route. The theory, to the best of my knowledge, on the X pipe is
> that it merges the exhaust gases from both sides instead of waiting for
> backpressure from the mufflers to "force" an equal state between the two sides.
> This is supposed to help in the area of exhaust scavenging too, due to the
> unequal pulses of exhaust as a result of sequence of the left and right bank's
> exhaust. This is where it gets confusing. It has to do with the fact that the
> firing order doesn't go left bank, right bank, left bank, right bank, etc...
>
> >I also heard there are some differences in exhaust sound. Can anyone
> >who has an x-pipe confirm this?

Read the latest issue of Muscle Mustang and Fast Fords. They have a good
article on the X vs. H pipes with Cats on their project Cobra and on a
blown Cobra.

--
Roger White

1997 Cobra 14.02/106 w/G-Tech (Borla Cat Back/best 0-60 mph - 5.05 secs)
271 RWHP
1995 GTS 13.90 @ 102 mph (GT-40 engine/E-303 cam/3.73's, w/radials) 241
RWHP

Gary T. Craze

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Feb 10, 1998, 3:00:00 AM2/10/98

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I have a Bassani X-pipe (no cats) on my '95 GT Convertible, mated to a pair of
Flowmaster 2-chambers with polished tips. The performance is excellent, although
I'm setting off quite a few car alarms in the parking garage now. I've got a pair
of 3 chamber Flowmasters on the way to experiment with the sound.

Best regards,
Gary

SEEverist wrote:

> A. Yeu wrote:
>
> >Recently I've heard people talking a little bit about the new X-pipes
> >that have hit the market.
> >
> >What are the major differences between the old H-pipe with no cats and
> >an X-pipe with no cats?
>
> I too am interested in these X pipes. Depending on what I settle on for a toy,
> I may go this route. The theory, to the best of my knowledge, on the X pipe is
> that it merges the exhaust gases from both sides instead of waiting for
> backpressure from the mufflers to "force" an equal state between the two sides.
> This is supposed to help in the area of exhaust scavenging too, due to the
> unequal pulses of exhaust as a result of sequence of the left and right bank's
> exhaust. This is where it gets confusing. It has to do with the fact that the
> firing order doesn't go left bank, right bank, left bank, right bank, etc...
>
> >I also heard there are some differences in exhaust sound. Can anyone
> >who has an x-pipe confirm this?
>

> I haven't heard a car with one of these yet, but it is supposed to be
> different. It has to do with the evening of exhaust pulses mentioned earlier.
> There will be a more constant flow of exhaust through the mufflers and out the
> tailpipe. I'm curious how this would sound with a pretty big cam that has a
> lot of lope to it.
>
> Hopefully someone has more technical information on these, and a place they can
> be obtained. I'd like to try them in my next car too.
>
> Steve
> Current head of the bashing department for rec.autos.makers.ford.mustang:
> "Weekend pass people" mode is ON!!

--
______________________________
Gary T. Craze
http://rampages.onramp.net/~gcraze

'95 GT Mustang Convertible "Crazy Horse"

WWI Nieuport 11 bi-plane under construction!

gary....@compaq.com
281-514-7893
Compaq Computer Corp.
Enterprise Computing Group

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