I've built a few V11 based cafe racer projects and thought I would pass on my solution to the hard to find and expensive after market exhaust options, the problem is finding the link pipes to fit a pair of slip on silencers, so I buy 45 degree mandrel s/s bends, 48mm o/d will fit inside the stock crossover then you need to sleeve it up to 50mm for most silencer inlets, or have the silencer made with 48mm inlets, alternatively buy the 45 degree bends at 54mm o/d and these will fit outside the stock crossover outlets, I've just ordered a pair of Delkevic s/s silencers 450mm long for £180 plus the link pipes are about £15 each from ebay, once you have fitted the 45 degree link pipes you can fit anything you want, the photo is a pair of cheap chinese s/s silencers