I was checking out this ITR yesterday and I have a question. When I started the car up, I noticed that there was this slight humming/vibration noise that was there for about a minute and then it goes away when the car is fully warmed up. The humming/vibration noise can be slightly felt/heard when I also give it a little throttle when the car is moving also.I think it could be the exhaust because when the salemans reversed the car, I heard a humming noise coming out of the muffler. Anyone know what this might be?

 

sounds like the exhaust is touching one of the heat shields. Is it a stock exhaust?

 

Yes it has the stock exhaust on