Take the baffle out. Wrap it with Muffler packing. Wrap the packing with mechanic's wire. Reinstall the baffle. Much quieter. More mellow sound.
Unless their baffles have changed since I owned one, I doubt that will work. Forgive the crudity of my drawing, but below is a basic picture of the "baffle" inside a MAC can.
The "Baffle" is essentially just to pipes that open at different end of the exhaust. The exhaust gases flow in from the header up to the inner plate which has one whole in it. This hole is connected to a pipe that goes into, and empties out on the far side of the can area.. The gases then have to travel back to the front of the can to enter the exit pipe, and then out of the can.
To wrap this in exhaust packing will, essentially, render the exhaust unusable because the gases will have no way to get from one pipe to the other.
WITH THAT SAID: You don't have too bad an idea there, it would just take a little bit of work to implement. basically, you would need to replace the two pipe system with one straight-through, perforated pipe, similar to what other exhaust manufacturers use in their baffles. You know, something that will actually "Baffle" the sound.
I put a lot of thought into this when I had my old Nighthawk 750 ('83). It had a MAC can that I couldn't stand. I never got the chance to try any of this as, at the time, I was a staving college student without the time, money or training to try any of this stuff. I still don't know if this would work or not, but the "Racing pipes" on my Ducati are basically just straight, perforated pipes with packing all around them. I started it up
once without the slip ons on. Never again...
