The E70 mufflers are much larger and those canisters on the outside are contained within the body. Just like on the muffler you pictured above, the valved tips aren't muffled at all, so I've seen images of where people have cut open the stock E70 mufflers and removed those canisters to make it more free flowing...all that work though, I'd rather just do a muffler delete or create my own straighter flowing system vs the two hard turns the exhaust has to make within the stock muffler.
http://www.xbimmers.com/forums/showthread.php?t=973042