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Can anyone tell me what the max boost should be on a 09 isx 450? What should it go up to on a hard pull?

871 is 40-41 psi I believe

Rawze wrote in a post in December last year....

(12-24-2016 )Rawze Wrote: [ -> ]* Cap for a CM870/871, that is about 38-39 PSI max pressure.
* Cap for a CM2250, that is about 34-36 PSI max pressure.
* Cap for a CM2350, that is about 30-33 PSI max pressure.

(04-20-2017 )Squish099 Wrote: [ -> ]871 is 40-41 psi I believe

40-41 is on the high side for a 871. 36-38 is much better, and they typically go to 38 max with factory programming unless there is something wrong.