"H" pipe install any advantages?
Team Owner
Joined: Dec 1999
Posts: 34,873
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From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Is that a B&B TriFlow system? The H-pipe should cut down some of the resonance. When I had my 92 vert with a B&B system the resonance was horrible at certain RPM's. There was a "fix" that they came out with but I thought it was a different resonator.
Not sure if there will be a performance gain as the resonator should be a single large chamber with baffles. In any event, it looks like a nice piece
Not sure if there will be a performance gain as the resonator should be a single large chamber with baffles. In any event, it looks like a nice piece
Thread Starter
Race Director
Joined: Feb 2003
Posts: 11,671
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From: Lake Wylie SC
It is well known that placement should be where the exhaust is the hottest along the pipes. But, I saw this placement on a site that talks about theories about exhausts. I lost the link as my old computer crashed and took a lot of my good stuff with it. Next time it's going to be an Apple.
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Drifting
Joined: Apr 2007
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From: port charlotte fl
H-pipes are not as effective as an X-pipe as far as performance goes,it's pretty easy to see one will flow better than the other.As for resonance most people have reported lowers levels with both.As for fitment it needs to go as close to the collectors or manifolds as possible.
Safety Car
Joined: Dec 2006
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From: St Marys GA
H-pipes are not as effective as an X-pipe as far as performance goes,it's pretty easy to see one will flow better than the other.As for resonance most people have reported lowers levels with both.As for fitment it needs to go as close to the collectors or manifolds as possible.
However, I have heard the exact opposite about performance. Yes, an x-pipe will make it easier for gas to get from one side to the other and equalize the pressure, but because of the bends in the piping, it increases the restriction. An H-pipe presents each exhaust side with a straight pipe, and the connecting tube is more than adequate for equalizing pressure. Hmm.
Safety Car
Joined: Sep 2000
Posts: 3,524
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From: Hinckley Ohio
My only comment is that GM put an H-pipe after the resonator on the LT4 exhaust, not before.
I put an H-pipe on my 3" B&B exhaust in the same location as the factory system. It did change the "tone" of the exhaust slightly, but had no effect on resonance, which is what I was looking for when I did it...
My car was used to prototype an H or X pipe, not sure which, in front of the resonator. I never saw what they mocked up and after weeks of delay, I finally got my car back without the prototype which I was promised....Oh well..
I put an H-pipe on my 3" B&B exhaust in the same location as the factory system. It did change the "tone" of the exhaust slightly, but had no effect on resonance, which is what I was looking for when I did it...
My car was used to prototype an H or X pipe, not sure which, in front of the resonator. I never saw what they mocked up and after weeks of delay, I finally got my car back without the prototype which I was promised....Oh well..
Thread Starter
Race Director
Joined: Feb 2003
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From: Lake Wylie SC
It's being welded up as I write this reply. I'll let everybody know how it works out. Chris at Freeman's Machine in Lake Wylie is doing the welding and he is truly a master at welding stainless. One thing, it will be pretty even though you can't see it unless it's on a lift.
Le Mans Master
Joined: Sep 2005
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From: Jenks OK
Agree about the placement!
However, I have heard the exact opposite about performance. Yes, an x-pipe will make it easier for gas to get from one side to the other and equalize the pressure, but because of the bends in the piping, it increases the restriction. An H-pipe presents each exhaust side with a straight pipe, and the connecting tube is more than adequate for equalizing pressure. Hmm.
However, I have heard the exact opposite about performance. Yes, an x-pipe will make it easier for gas to get from one side to the other and equalize the pressure, but because of the bends in the piping, it increases the restriction. An H-pipe presents each exhaust side with a straight pipe, and the connecting tube is more than adequate for equalizing pressure. Hmm.
There have been shoot outs between x-pipes and h-pipes before I'll see if I can find a few links..
Thread Starter
Race Director
Joined: Feb 2003
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From: Lake Wylie SC
I had it custom made. It's stainless and fits nicely. I'm currently putting it in as I write. Making the 3" pipes fit correctly is not easy with a vert. Having the whole exhaust welded makes more room for the X-frame.
Instructor
Joined: Aug 2006
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From: Florida
Drifting
Joined: Feb 2003
Posts: 1,978
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From: San Antonio Texas
Some early testing showed very little difference between H & X. Later tests i've heard of, were showing a bigger improvement, but I wonder if this wasn't just to sell expensive X pipes. I know some X pipes look like they'd flow much better than others...smoother curves and less "clashing" of the gasses. Either will show bottom-mid range improvements and smoother sounds. The old method of painting a stripe on the pipes from the collector back is suspect now;too many variables. Perhaps a "steady speed" at the peak resonance RPM would burn-off the paint at the proper point for installing either?
Thread Starter
Race Director
Joined: Feb 2003
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From: Lake Wylie SC
Well, one thing is for sure, the exhaust system is much more secure. And if anyone gets under the car, it looks really good, even exotic. 
All that is left to install is the tail pipes and mufflers.
All that is left to install is the tail pipes and mufflers.