I imported the model from Blender 2.82 to 2.79, and rendered with V-Ray 3.7
I didn’t change the tunnel much since it looked fine already, and I used a combination of the sun beams node and a depth pass to simulate the volumetrics at the back.
EDIT - Adding two later renders. The Tesla and Camaro car models are from the same source. I can only take credit for the materials, lighting and compositing:-