Picked up a set of stock mufflers from someone over at R1-Forum.com, and over the course of the past two weeks I've worked on rebaffling them at work when I had extra time. I used A&R's race baffles, here are some pics and vids
Shot with
Canon PowerShot SD750. 
Shot with
Canon PowerShot SD750 at 2007-06-25
Stock Mufflers:
YouTube - Stock 04 R1 Exhaust
Without Mufflers:
YouTube - 2004 R1 without mufflers
A&R Race Baffles:
YouTube - 04 R1 with A&R Race Baffles