does anyone have a rattle thats comes and goes as they drive its more pronounced when its cold but it allways seems to go away. It apears to come from the rear of the car, BTW i have the invidia n1 exhaust. What could it be. I need to figure it out b4 i pull all my hair out

 

probably exhaust hitting the underbrace (some people have suggested adding a couple of washers as spacers)

or cats hitting heat shields (bend the heat shields out of the way)

 

i dont think its hitting, im not sure. Ill look im at college so ill have to go out with my jack and do it while its light today, anyone have other idea's also where do i put the washers