Suzuki

I hear boom boom noise from exhaust on my 04 suzuki katana 600, anyone know why? its not the normal noise.

Is it a pop or a backfire?? if a backfire does it happen on decel ??? have you changed your exhaust system or the air cleaners or carbs ?? if is a backfire out the pipes you may have an over rich low speed jet..or you may have burnt a valve.