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As for me, I am running no cat. I have a 2.5" ISIS over pipe, 2.75" J2 front pipe, and 3" Perrin non-resonated catback exhaust.
I mainly hear the ticking noise when I apply medium to hard pressure on the gas while driving. I do not hear it when I gently or slightly tap on it or cruising. It's hard to observe the ticking when the car is parked while revving the motor up, you'd to be driving make it more noticeable. I may have to look underneath around the area again for black carbon build up since I did not see anything last time.
Sorry, I don't wanna thread jack anybody. Hoping if anyone else have this same issue.
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