03 yz450 stage 1 hot cams

[DirtDogZNJ]

Can anyone tell me how much of a difference hot cams stage one in a 03 yz450 make and if i would notice more with an after market header and silencer on it.

 

[SuperMoto]

Here's the dyno chart from Hot Cams.

 

[DirtDogZNJ]

Thanks> Im sure i have already seen that just wondering if anyone has personally done it and thought it was worth it.