Phillip Eeno
New member
I have a 2008 Infiniti G37 Coupe with an after market cat-back exhaust and coilovers. Recently I noticed a hollow metal sound coming from underneath the car, sounds like the rear passenger side. The noise gets more noticeable after the car has been driven for quite some time, like on the freeway. It's noticeable at speeds of 15-25mph and doesn't appear at first warm up and drive off. I was able to duplicate the sound by tugging and pushing on the rear muffler and exhaust pipes when the car was off, parked and just driven/still hot. Two shops misdiagnosed the noise with one saying it was intakes that needed to be tightened and the second saying it was the tips of the exhaust hitting the rear body fender. But in both cases, the car sat for about 90 minutes before the shop looked at it. Both shops did checks to make sure everything was tight, and it was. I even went under the car and pulled on some of the components at one of the shop. The sound appears when the car is hot, and when a load is on the car. Real weird. I've checked for any Infiniti service bulletins and none exist which cover this. Car doesn't drive any different. Any possible insight would be greatly appreciated. Thanks