Well it's coming!
Here are a couple sneak peeks at the second prototype. This is the final "production" prototype. This muffler was exclusively designed for the Tenere. They went with a modified new version of the RS-4. This is actually a Dirt Bike muffler. The muffler options should be the same as the RS-4 with 3 muffler options: Aluminum, Titanium, or Carbon Fiber. All of these options will have Carbon tips. The prototype in the photo is made from just basic materials.
From what I have been told the testing is over and production has started. They should go on sale late July or August. Can't wait to get mine.