Many things done on a modern car are logged & traceable. But tuning is normally not visible unless a service agent is specifically looking for it. However tuning does not, as many believe, allow your dealer to 'void your warranty'.
With the installation of any aftermarket item, warranty can only void where it is shown that it is the non-OEM item that has caused a problem. e.g. If you were to install software from a backyard tuner who overboosted your engine, you should not expect a bent conrod to be replaced by the manufacturer under warranty. But you can still expect broken air-conditioning to be fixed. Our tunes are conservative and very well tested, and our BSR warranty is specifically designed to cover you in instances where installing our tune has an effect on your manufacturer's warranty.
As such, we don't believe there is any need for you to conceal that your car has been BSR tuned, from your service agent or dealer.