06 kx450 jetting

I have a 06 kx450 I ride around 800 ft most the time. I have a power bomb header I'm getting ready to put on. Any suggestions on jetting and needle position?

You should not have to change jetting. 

Ok I'll put it on and see how she likes it. And go from there.

The bike backfires now with the header on. I haven't tries adjusting anything yet.

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