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This would most likely pertain much more to straight, open pipes, as opposed to "Bafflectomized" ones.

The Stock Triumph pipes, even with the end baffles removed, have enough interior baffles / plates/ / shelves, and volume to help return pulse waves back to the exhaust valve face. These assist in scavenging the cylinders, especially during the cam overlap periods at lower RPM's.

On straight pipes, or shorty pipes, this back/forth pulse action doesn't occur at the lower RPM valve overlap periods, as there is nothing to rebound against, and that is why you see a dip in the torque curve under 5252 RPM. Moreso if the pipes are too large in inside diameter.

This eyebolt thing is an old, old trick dating back to at least the 60's. Actually, there is an expensive, $75.00 version of this technology floating around for HD guys.

Super Trapp silencers, and a few others use variations of the same technology.

Yes, it works, and works well. If you have straight pipes, you can turn the "o" of the eye bolt perpendicular to the flow to create a means to rebound the pulses if you are going to be just tooling around town, or going through twisties and need lower end torque.

Turn the Eyebolt sideways, to minimise rebound, if you are doing a high-speed run, or are traveling on the slabs long distance.

Lastly, many of the newer high tech expensive bikes do this electronically as well, which goes to further prove that sometimes the easiest and simplest technology invented in someone's garage works the best.
 

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