[GreymaroSS]

I have this same exact setup and from what I could guess is if your looking into the engine bay on the passenger side header on the bend that goes past that brace that goes under the car rubs against that brace. There is a very slight gap of light when the pipes are cold but when they heat up I'm sure that gap closes. It's weird I was worried about the same thing but after a while the noise just stopped