06 yfz 450 cam help

i recently bought a 06 yfz dirt cheap..its totally stock..im lookin to make sum upgrades in the future..but i was told from a friend that you can either decrease the exhaust cam or increase it to make more power..but he wasnt sure which you had to do..is this true and which do i have to do?

Edited by yamaha_06_yfz

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