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Will the 45mm go straight on? Almost definately Yes.

Will it affect the warranty? In real terms, almost definately No. But .....

Will you need a new chip? Almost definately Yes. And the ticker says warranty void if removed. But a Ducati Service Centre will just replace it.

If all done by Ducati Service Centre then you'll not have a problem with Ducati UK warranty. If you do it yourself, well they might say you contributed to it's failure.

If you want to do it yourself you can order the sticker as a part number.