I installed a Webra MagicPipe and regulator on my Dyna-X with a Webra 91AAR engine last weekend. This combo really rocks! You get smooth engine till the last drop of fuel and power is even more than with the muscle pipe, but a lot more quiet.
There is one thing you should know if you're planning to install the MagicPipe on Dyna-X. You have to add spacer between engine and muffler so that the muffler doesn't hit fuel tank and melt it. Here's how I did it. I works great and gives about 10mm clearance to the tank. I did cut of the peace of the MP adapter marked in red color. Sorry Curtis, but it works great
And a pic of that shiny pipe as well.
Just wanted to let you know.