So I was coming home from work this morning and when I got home, I slowed down and then I heard a weird noise under the car.

What it sounded like: Put a penny in a tin can and shake it around

or

A rock bouncing through the exhausts.

(This is not the normal crackling under the car).

It happened for about a second or 2, paused for a second or two and then happened again for a second or two.

Only thing I have done to the car is changing the brake pads to the hawk ceramic a few days ago. Any ideas?

 

Did you actually look under the car for a loose or hanging object, like a heat shield?

 

Yeah, nothing

 

How old is your car?

 

2008, bought it in december 2011

 

I would get the exhaust system connection under the body checked by the dealership. I had complaint several times to Infiniti, initially they found the connection to be little lose which is making the car shake on idle and loud. I have learned to live with it but it is little annoying. If you drove a G37 loaner, the engine is much smoother and quiet....