Short ride from NYC, Hudson Valley Motorcycles
http://www.hudsonvalleymotorcycles.comSpeak to Steve.
Yes, it can be leaking from any connection or it can be mapping. With or without DB killers? Slip-ons or full exhaust? Without popping is more likely. Also, if it is a mapping problem the cure won't be cheap. Keep in mind excessive is a relative term. My neighbor across the street has a V Rod with open pipes. Open and close the throttle quickly, KABOOM! Ride normally and roll off the throttle, fine.