Cobra offer a quiet baffle for these mufflers, part number is: 9026.  Unlike V&H mufflers, there's not much info out there on the quiet baffles, I had to contact Cobra to get the part number.  The quiet baffles are a drop in replacement for the standard set and come wrapped in new fiberglass wrap.

The quiet baffles have a significantly smaller inner diameter than the standard baffles.  See pics below.  The difference in sound with the quiet baffles is not huge, but they do reduce the noise enough so they're bearable.  The sound is also deeper than the standard baffles.  Overall the sound with the quiet baffles is much better.  It's not so annoying that you're ears are ringing after a few hours, but still loud enough to give a nice sound.  I suspect that performance is also better as the diameter of the standard baffles is ridiculously large, they're basically drag pipes.  In comparison, the quiet baffles would give a decent amount of back pressure.

The Cobra 3" RPT mufflers (part no: 6081):

Difference between quiet baffles and standard baffles:

Cobra 3" RPT with baffle removed:

I had a similar problem with my TAB Exhausts, went from 2" Baffles to 1 3/4" Baffles, deeper note, less a cop magnet, plus no more ear plugs.

The Guys that run their HD's with excessive Exhaust noise just make it harder for the rest of us.

I don't suppose anyone on here knows where you can purchase the Exhaust matting, from over the counter (Victoria)?

However I don't want pipes like Short Shots where I lose performance, plus get the annoying sound which will tire me early during long rides.

Cheers Mick 

Ps, wear gloves! Horrible shit!!