Chevrolet Colorado ZR2 Concept not only looks aggressive, but has a 181bhp punch THE Chevrolet Colorado ZR2 concept not only turns heads but sets them spinning with its new 2.8 L Duramax diesel packing 181 horsepower at 3,400 rpm and 369 lb-ft of torque at 2,000 rpm. The aggressively styled concept builds on the capabilities of the production Colorado [...]