When my car is warmed up (running or recently shut down) there is a tick noise coming from under the car. It comes from about half way back, about as far back as the cat I would guess. I can't tell what it is coming from. When it is making the noise, it ticks periodically, about every 4-5 seconds. I installed Cattman catback exhaust about a month ago, and I have started noticing the noise in the past week. I don't know if it is related. Anybody have any ideas/experience with this?

 

Here is the link you should read http://forums.maxima.org/showthread.php?t=377905 should explain everything nothing to worry about

 

Thanks man, I was hoping that was the cause.