- Check the top nut inside the trunk make sure its tight
- Check everything in the rear coilovers making sure its tight
- Your Dampers setting might be too stiff, Soften them half way or so (too stiff = bumpy ride on bad road)
- Get a torque wrench to tighten all your wheel down to spec
- Get Hub Rings for your aftermarket wheel if U have Aftermarket.
Modifying car is a headache, Shoulda keep it stock OP
