Here it is! Enjoy guys! Editing up the first ride video now.
The isolator on this exhaust wraps around and has a smaller contact area to the frame, so it actually should be less. The vibration you feel in the seat is from the percussion and bass from the exhaust note. A lot of low end resonance that the baffle will eliminate.I wonder if the removal of the rubber bumpers from the stock exhaust box to the frame might allow more vibration transferring to the frame.
My rubber plug also fell in the hole and I even took off the muffler to try to take it out. Messed up my elbow wrestling it off and I could not get it out no matter what I tried.I installed the alpha on my Z yesterday and I can confirm installing the baffle is a pain. I took a tiny piece of shop towel and shoved it in between my allen key and the screw to hold it in place. Worked like a charm and kept me from dropping the screw. The much larger issue for me was the rubber plug. I went to push it back into the opening and it immediately fell inside. I tried everything and I didn't even get close to retrieving it. I finally gave up so hopefully there won't be any issues leaving it in there.
I also struggled with chassis bolt removal. The bolt would just spin. The brake side nut is very difficult to get to since it's packed behind the rear brake lever assembly. I was finally able to shove a small wrench (from a small pocket multi-tool) in there after several attempts to fix this.