Jetting w/ Pro Circuit Pipe

I need some ahelp. I have and '03 450 currently with stock jetting. I just put a Pro Circuit Ti 4 exhaust on it. I am still running the stock header pipe though. I live/ride in So Cal and need suggestions for jetting with that setup. I have not ridden it yet as I wanted to be sure it's jetted correctly first. Anyone else running this same setup? Thanks.

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