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I had a custom cat back system installed about 2 months ago. Ever since they installed it I have had a ticking noise from under the car near where the resonator is located. I called the guys and he said it was normal until the carbon builds up in the new system, like a new car. So... I said okay.. now 2 months later same thing.. it is a very constant tick that doesn't seem to increase or decrease with throttle I have put 1k miles on the car since the install... any opinions?