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Old 03-28-2003, 06:37 PM
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Post H PIPE OR NO H PIPE

I HAVE HEADERS ON MY SBF AND I WAS WONDERING IF I SOULD INSTALL A H PIPE I HAVE SMALL TUBE HEADERS 3" PIPES AND JUST ORDERED FLOWMASTERS BUT SOMONE TOLD ME IF I DIDNT PUT A H PIPE ON IT WOULD SOND LIKE A IMPORT ON BOTH SIDES IS THIS TRUE I COULD SEE Y IT MIGHT BE 4 CYLINDERS ON BOTH SIDES OR SHOULD I USE AN X PIPES THANKS JJ

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Old 03-28-2003, 06:56 PM
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Whoever told you it would sound like 2 four bangers has smoked too much crack lately <img src="graemlins/pimp.gif" border="0" alt="[pimp]" /> The H-pipe reduces backpressure due to 2 consectutive fires on the same bank of cylinders. It basically makes it so that each bank is running with dual exhaust. It also changes the pitch of the exhaust, making it slightly deeper (maybe due to the larger area for the exhaust resonate ) An X-Pipe is just more advanced than the H-pipe. It further helps the scavaging effect of a crossover pipe by improving the flow between the two sides. I hope this helps, and if this were my project, I'd go with an X-Pipe.

btw, don't ever use all caps in a post again, it is considered shouting and is very rude.
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Old 03-28-2003, 07:10 PM
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yes that helps alot thanks sorry bout the caps wasent paying attention
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Old 03-28-2003, 07:52 PM
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Can I say that I have heard in some cases h pipes can do some harm to preformance. I can't remember if this happens when the center pipe is at an angle or when it is not... Look into it more before you do it
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Old 03-29-2003, 04:45 AM
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I could be all wrong on the subject, but the main purpose of the H pipe is to reduce the severe resonance problem created by the Flowmaster technology dual exhaust systems. Tuned exhaust systems have been around for years and there has been alot of R&D in the higher performance community. Exotic headers that have been custom made to ensure the same length tubes and the length of the tubes are known to improve horsepower/torque. Many race car teams have Siamezed the duals at a calculated point aft of the collectors to alter the HP/torque points. This point is ideally where the exhaust flow becomes subsonic and coincides with the planned engine operating RPM. A few years ago, Winston Cup driver Sterling Marlin won a couple of Datona 500 races and his exhaust sounds were noticably different and it took the other teams a while to figure out what his deam was doing differently. Now I think they are all doing it. Most of us street rodders do not have the room/space to siameze in the calculated spot and even if we could, the results would only be realized at a very narrow RPM range.

Basically, if you dont have a resonance problem, don't bother with an H pipe.

Trees
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Old 03-29-2003, 05:17 AM
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I put an H pipe on em all. It helpes to keep the pressure equal on both sides. That is the main reason for it. On a 2 1/2" exhust I run a 1 1/2" crossover , or H pipe. Unless both sides of your exhust are perfectly identical, then the pressure will stay about the same on each side. If they are not the sime (What I mean by the same is the same leinght, bends, contores, muffler placement, everything.)The pressure will noth be equal per side and the motor will never perform right. It may run good but it will never be right.

I learned all this on the drag strip 20 years ago. And I still tune my exhust to this day. A well built exhust can mean the difference of almost 2 seconds on the strip/vs/a stock system.
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Old 03-29-2003, 06:16 PM
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I hate H-pipes!!!!!!!! It made my dual Flows sound like cheap turbos. Steve
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Old 03-29-2003, 09:13 PM
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There is a possibility that you could gain 10-15 horse with a crossover. The question is what would fit best in your car. They say if you use a H-pipe setup get as close to the engine as possible. I've been told that draggers like an X-pipe a little more. It will equalize your pipes and give the car a smoother sound. Rule of thumb on a H-pipe is half a inch smaller than your pipes, if I remember right. I've installed a few of these on various vehicles and it does make an improvement.
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