Well, don't have one on my bike, but I'd say (or remember) sneezing, rattling, poping, strange vibrations, O2-sensor confusion, unexpected side effects so to say . Or, quoting old Donald R., 'unknown unknowns' might happen.
I'd just fix that first. Don't try to tighten it, someone over here stripped the bolts trying this. Go for new sealings.
Hubert