I bought the quiet baffle to go in when we go touring.
The stock baffle was in when I went on a days run to West Wales. Around the lanes it sounded fantastic, but got on my nerves when just cruising on the duals & M-ways.
We also discovered it was hard to hold down a conversation with the Scala headsets as the exhaust was just that bit too loud.
The quiet baffle is on the shelf awaiting the next trip or longish ride.
The stock baffle fell out a while back and was lost (in my garage

)
Yeah it's noisy, but Loud Pipes Save Lives- with all the barely awake halfwits round here I need all the help I can get on the morning commute.
But yes, took a while to figure out how the stock baffle comes out. Obviously undo the bolt (not letting go of the baffles as you'll loose it in the can) I turn it maybe 30 degrees Counter clockwise, then wiggle the thing till it pops out. There is a little ridge running inside the can that stops the baffle being blown out if the bolt comes out, you have to wiggle it so the lugs on the baffle jump over the ridge. after you've done it 2-3 times it's easy.
I'm thinking every can will be ever so slightly different, so If 30 degrees(ish) doesn't work for you keep rotating and wiggling. It does come out.
EDIT. the pics I'd seen of the quiet baffles were like this:

Normal on the left, quiet on the right.
I don't have a pic of the quiet one I received, but I'll get a pic later.
It's a tight fit. had to give the open end of the can a wipe with a rag and some WD-40 to clean it and a small hammer to tap the baffle into place, and a pliers to rotate it to get the securing bolt holes to match up.
(check the holes are drilled cleanly, I had loads of metal bits sticking out of the edges of the hole on mine and had to file it down to fit.
