2003 wr450f jetting at 5000 ft

Any one help with jetting at 2003 wr450 at 5000ft. Still has stock jets. I think 150 main and 47 or 8 pilot. Ever since I changed stock pipe to titaium aftermarket it seems to be running lean on top end. I have changed the main to 155 with no help in running. Thanks in advance

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