I have been doing a lot of research into all kinds of performance parts and if the XT and raptor sleeve length is the same, then it might be possible to increase compression without replacing the piston. Taking the stock XT's 10:1 compression to around 11 and maybe a bit higher. That compression should be fine with a nice high octane fuel you can get from a normal fuel station and should add 1 or 2 HP.

If not, we can still increase compression with playing around with the head, but both options becomes a bit more complicated than just adding a new high compression piston.

Kev, do you know the combustion chamber volume on the stock XT head?

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Disclaimer: any mod undertaken, are carried out at owners risk