Go to vstar1100.com, click on exhaust and check out the modification of the 1100 stock mufflers. It is exactly the same for the RSV. I just did it yesterday and love the sound. Bike runs great. Not too loud, can still hear tunes,CB, and sometimes unfortunatly the other half on the intercom. It took me about 45 mins. total and $100.00 for a pair of stock muffs picked up on Ebay. I kept my stockers just in case. I do have a pair of Stock head pipes for a 2007 RSV in case anyone is looking for a pair in perfect condition. Try the modification, You will be very pleased. By the way, there are pictures and all on the 1100 site step by step.
Ride safe All
Mike Allen