http://www.mb-diesel-cars.com/images/trucks/smith1.jpg
http://www.mb-diesel-cars.com/images/trucks/smith2.jpg

These were taken at MIR (Maryland International Raceway) on Truck Day. Diesel power at its finest.

Can anyone guess what this truck is powered by?

Ok, I can't wait... It's a quad-turbo Detroit Diesel V12 (two-stroke).