Best cam gear application for 2.0 liter P5

P5_2003_tuner

Tune it to Boost it
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2003 mazda protege FS hatchback
I'm trying to fine tu e my P5 and squeeze as much power out of it i can without going turbo. Next step is cam gears. How easy of an istall is this if ive alredy changed the timing belt and clutch in comparison? second, what cam gear will i be able to see some solid HP out of? Can anyone help me out here?
 
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