Leo Vince Slip-on for F800s
Hi Tazz
Because the LAMBDA sencor is on the header part and due to the fuel injection you dont need to do anything.
You might use more fuel as one tends to be happier with the throttle.
Hi Ruan
Thanks for the reply, puts my mind at ease a little. I've scoured the internet for posts relating to slip-ons and a few other manufacturers (and other brands of motorcycle) recommended a "retune of the engine" after installing a slip-on. So I was just worried I might need the same.
Sometime it is advisable to retune when you fit an entire syst and have performance filter as well, however with just the endcan it's about sound only and the little bit of weight saving so just fit and make some noise 
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