Sorry if this post looks like "spam" we certainly never ment it to be,and this is our lst post, but we must answer some statements regarding the Vortip.
First, we are the designers of the Vortip. White Brothers actually got permission to sell it under the White Brothers name from us..Why? Quantity and distribution. That's why we can sell it for less.
About the Vortip:it is stainless steel...which means it never rusts (not the tubes, the down turn.)and it never needs packing as do many other types of exhaust tips. As to the performance, we tested it extensively - all people that tested (magazine editors as well) agreed compared to an "unplugged" exhaust it was close to the same. (A minimal amount lost on the bottom). Cost is the difference between spending well less than $100 for a tip and in many cases $300+for a pipe. The Vortip uses the existing internal screen which is a spark arrestor directly from the factory.
Sound was our main reason for developement.(increased power was easily accomplished by removing the restrictive exhaust plug.) Riding a bike after hours that's loud is hard on the ears, and causes neighbors and friends to complain. This was determined long before the new laws came into effect!
Jim Patterson is 100% correct about the design (different tubes at different lengths, and diameters.) This was an idea used in Car mufflers. Reason: Sound "bounces" off these tubes - redirecting it (thereby decreasing it). The "downturn" also redirects sound toward the ground instead of straight out. You could make an exhaust that did nothing more than downturn (LOADS OF FLOW) - however, it would just direct the sound to the ground. And any material that was not stainless would rust in time. Many companies simply powder coat...we felt the stainless looked the best.
We are currently working on this same principal for numerous bikes - an inexpensive quiet way to increase power. Keeping in mind the Key Word is inexpensive. We are aware that a pipe may increase power over this small exhaust tip, but the price is a major factor.
Thanks to everyone, we really appreciate all comments, and would be happy to answer any questions.