I just had a catback system installed using aProchamber straight thru muffler.Problem is,when I'am idling I here a Pinging noise coming from my muffler.Is this trapped condensation will it go away? the shop that installed my system said he'll change the mufler to a flowmaster wil this solve my problem?the pinging is annoying,has anyone out there had this problem?thanks

 

Maybe there's a leak or something, or the installer left his muffler wrench in there, creating the pinging.