General wisdom is that it'll run a bit lean. To be sure, get it dyno'd and/or fit an aftermarket chip such as a bbpower or a teclusion box.
My 1100 was running with a Remus Race can, front silencer (replacing the 'collector' box) and a bbpower chip set on the recommended program and the plugs showed a tendancy towards lean/hot - went like stink though!
I've since fitted the std exhaust for neighbour relations & hearing comfort reasons and with the chip switched to standard settings it seems a bit on the rich side - still goes like stink - just nobody notices!
If I could fit a baffle to the race can I'd be tempted to fit it again just for the sound!
Mark