Been working on my PhD hence the silence, been developing real-time global illumination solutions so I've written a few different renderers to test idea and such. But every renderer needs a good reference solution so my path tracer (being one of the renderers) has been developed at the same time.

This image was run as a material test, body is the Ward BRDF, wheels and all metal parts are the Lafortune BRDF with the brushed metal settings courtesy of PBRT, winshield and headlights are dielectric glass with Beer's law and the plane is just good old plane perfect diffuse with some tile procedural texturing. All lit by my favourite HDR lightprobe from Pisa.

Model is a free one avaliable off the internet with a "use for whatever you want" license.

Technical details:
2500 spp (overkill most likely)
52min rendering time on the cluster (23 quad-core opterons)