Car Diffusers › Haven Car Diffuser Haven Car Diffuser $8.00 Cedarwood and mahogany softened by lavender create a balanced, grounding scent. Calm, clean, and quietly powerful. Vent Clip or Hanging: Hanging Vent Clip Add To Cart Added! Cedarwood and mahogany softened by lavender create a balanced, grounding scent. Calm, clean, and quietly powerful.