The weather here in GA is starting to get a little colder. I've noticed that when I'm at a stop I can hear a loud ping coming from what seems to the be the right side exhaust. It happens once every couple of minutes. I don't notice it during driving but maybe I just don't hear it. It is probably the heat shields flexing on teh converters, has anyone else had a problem with this? I think maybe a weld is not good. I looked at them but couldn't tell much. If it is the weld, other than annoying, will it hurt anything?

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1998 F150 XLT 2WD, reg cab, styleside, swb, 4.6L, auto, red w/grey int.
Modifications: Replacement black leather steering wheel, Leather seat from Lariet, cd/cass combo from a superduty, 4WD bumper with lights, 4WD fender flares, Ground force lowering 2/4, 17" STX rims with 255/60R17 tires, lorider hard cover.