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@M_V
Maybe, I think the amount of fuelling change that the lambda sensor can effect can vary massively. Ie some bikes will be able to adapt to the new pipe, for others the leanness will be out with the capacity of the system.
I've had 3 injection bikes, a Yamaha XT660 which had a bit of user adjustment built in and would also readily 'learn' new pipes, an HD which according to HD would blow up if you fitted slip ons and didn't pay for the very expensive remap (but in reality it seemed there was no issue unless you live/ride in hot desert states in the US) and now the KTM which reports are saying looses a lot of power with pretty much any pipe or slip on other than the KTM approved Akra kit which includes an ecu reflash.