This is an older thread but since RedRooster has brought it back to life and tied in my more recent one on Getting More Out Of the Stock Pipes, I thought I ought to chime in.
As mentioned in my other thread I am very pleased with the sound of my simple pipe mod. But it is very different from the 'gutting' of older type cans such as is mentioned in earlier posts to this thread and written about in DUC's article “Muffler Coring --All the Sound at Less Than Half the Cost." (
www.duc.bz/MufflerCoring.htm )
That approach keeps the stock exterior of the of the cans but creates internals that are true 'straight throughs' with a perforated tube - the essential design of lovely and very loud "race cans" that are so much a part of recent Ducati lore. An approach, btw, far easier to perform on a cannister type system than on the more finished-style mufflers found on the SportClassics.
My mod as mentioned in the "getting More" thread is simply, as its name suggests, a way of letting a bit more sound out of the stock cans with a minor alteration. They are not nearly as loud as 'straight throughs,' nor do they produce the same visceral thump in the chest that so many of us love but find unsuitable for daily use on the street.
-don