Exhaust Leak?

[bhall02]

Hye, i was riding my 400ex today and it was bogging down at the top of each gear. I think i might have an exhaust leak. I have an Hmf pipe, would changing the factory header solve my problem, or what else is there i can do?
Thanks

[hondarider2006]

Did you mess with your jetting once you installed the HMF?? If you did, check your main jet, it may have come out. If it runs fine all the way to WFO....I am betting that it came out. An exhaust leak wouldn't do that;)