So I have Tein Flex z installed on my 2003 g35 sedan and I recently hit a big pot hole about the size of a 2 basketballs lol and ever since I hit that pot hole my driver side coilovers rattles when I go over bumps it sound like a soda can tab spinning around a soda can is the best way I describe the sound lol keep in mind my coilovers are literally less than a month old and I doubt they are blown from the pothole.i double checked the spring and all I see a small metal scrape on the green springs but nothing seems broken.i run my springs super stiff and tried to soften them up but I still get the noise.does anyone know the solution?

because all my suspension components are new and it sounds like the spring it self. It sound like a metal/spring rattle

Make sure the nuts are tight under the hood. Give the coilover a good inspection. Make sure the adjuster collars are tight against eachother. Take the wheel off...jack that side up and bang on everything...see where the noise is coming from.