har har...
So I have this open short muffler that has the silliest baffle i've ever seen in a bike. Kinda useless as baffles go considering there is no back plate to force the air around. I was considering crimping the end of this together (side towards the header) to reduce the open airflow. It actually looks like the end used to have a donut cap on the end of it that was lopped off. Any suggestions?

Yeah to tell you the truth, that was where I got the idea of crimping the end. I just wanted to know if anyone else has messed with it. I'm gonna try it out this weekend with it modified. If all else fails i can just cut the end off again lol

Yup, those style baffles are pretty ineffective at quieting down an exhaust. They also tend to create a "poppy" kind of sound. Not my favorite style for a single cyl. engine. For engines that have a natural tendency to get this kind of sound I prefer a "chambered" style exhaust. It tends to create a smoother exhaust note. The packing that should be around it also has a tendency to burn up and blow out, making it even louder. My Jardine had a very similar type of baffle (I'm the one that modded mine).
If there was a "doughnut cap" on the end that was cut off it's going to be difficult to quiet it down. You need that cap to seal off the end. You can take some measurements and go to the local auto parts store and try to find an exhaust reducer that will just fit inside your pipe (it needs to be snug) and can be welded to the baffle.
You may try punching a tab down into the center opening kinda like a "Screaming Eagle" Sportster baffle. This forces some of the exhaust gasses to go to the "outside" of the baffle and it then goes back into the center core (and out the end of the exhaust pipe) via the louvers that are punched into it.


Anytime you can divert the flow of the exhaust it will lose some of it's sound energy and become quieter. If you can maintain a smooth flow and not cause a lot of turbulance you can maintain your power as well.

Using Onelunger's link I found some good other good ideas you  might be able to work with...these look similar, but crimped a few inches in from one end.

Personally, I would just throw that in and give it a try. Looks like it might work as is. With such a small amount of space, I don't think that you can wrap any additional baffling in there.

Took the bike for a quick spin around the block and suffice to say I have some rejecting to do. 1 - 35mph an half throttle are fine but pulling back makes it stutter and on decel the idle dropped VERY low when I rolled to a stop. The difference in backpressure is amazing! Now for the fun of tuning...

Oh I know that, it's the second baffle that made the change. I had previously been using a chopped up dyna with the baffle knocked out so going from that to this is why I think there was such a change in performance. Way too rich more than likely.

But what is the hazard of having the packing inside the baffle? It's not likely that it's going to fly out.