Weird noise, anyone have similar experience?

azn370z

I've had my z for over 2 years and 20k miles. I have stock cats but berks cbe.

I know what the sound of a screw in a tire sounds like. I know how the brakes can make a clicking sound if there's rust from moisture.

I left work, no noise while rolling through the parking lot. Once I got onto the road I heard a noise that is hard to describe. It sounded like a metallic sound, maybe the sound of something dragging, maybe something in my exhaust, or maybe something rolling in the barrels of my wheel. I think the speed of the noise increased as I drove faster. I believe the noise did stop but started up again as I drove. At one point I thought I heard the sound of gas coming from my cats. Once I got on the highway the sound disappeared.

When I got home I did a visual to see if my exhaust was loose or anything in the tires, and rotors.

So anyone have a similar experience or know what happened?

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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts