interesting find??

[DMorris]

Thanks, guys I'm glad I could contribute something to the forum.
As for what it means, Mr. Greene, I guess I would summarize it by saying the x-pipe looks really cool!

posplayr, being a tech., I have some experience with standing wave problems. I am involved in a project at work evaluating machine tool spindles and their variable freq. drives. One of the issues we deal with is impedence matching.

The tuned exhaust issue is just one side of the resonant tuning issues in general. On the intake side, the length of the intake tract is doing the same thing and a mismatch can result in 'multiple carburation' .(intake charge moving back and forth through the carburator) This condition is the cause of the 'flat spot' that often shows up in tuned engines.

Best, Don

[reddirtrider]

If it worked as well as they say, every GP machine would be running them. As was stated earlier, any benefits associated with standing wave theory should be frequency dependant. If you buy this product, do it for looks (if it trips your trigger).

[drhach]

...
So given teh analysis, the X-pipe might very well improve performance, but it would likely be at only one specific RPM and fall flat else where.

I did some computer simulations using Ricardo a few years ago for a CBR600. From that , I built a 4-1 header. We were trying to determine the best place to put the collector. One thing that we observed is that collector placement does help for certain RPM ranges; both in theory and in practice. This is true on the intake and the exhaust side. It doesn't necessarily cause the engine to "fall on its face" in other areas though. The torque and HP figures are about the same for each design in other areas other than those that you target. There actually are pretty basic formulas for calculating the intake and exhaust tract lengths required to optimize a certain RPM.

Form the picture of the x-pipe, it appears that the collector is not too far off from where it might show up on any other 4-1. Again the biggest thing is that the guy who sells it won't release hard test data and nobody seems to want to admit to owning one of these. I would think that really, the decision to purchase it should be basd on price alone. It probably would perform better than a stock exhaust, if it was cheaper than a V+H, I'd do it.

[rapidray]

Basically it is a "gimmick" pipe. We tried one in the mid 80s on an 83 1100 & it made more bottom end, the SAME midrange, & LESS top end than a V&H 4 into 1. Oil changes SUCKED with that pipe too!!! Ray.

[Colin Green]

Sucky oil changes alone does it for me. I don't give a toss how pretty the pipes look, if I have to remove them to replace the filter and oil 3 or 4 times a year..... or go the other way and stuff the motor due to lack of oil & filter changes... It ain't gonna happen.

Re comments about sellers evasiveness and having read his marketing piffle, references and older threads here (incl.. from memory some open dialogue between the seller and a member here). I wouldn't waste my time or money.

[tkent02]

Basically it is a "gimmick" pipe. We tried one in the mid 80s on an 83 1100 & it made more bottom end, the SAME midrange, & LESS top end than a V&H 4 into 1. Oil changes SUCKED with that pipe too!!! Ray.

Sounds like a stock muffler without the ability to change the oil....
The guy's a bafooon.