Denso Iridium Power Spark Plug (ITV16 x 1). It steadily gives a high level of response under a variety of driving conditions. The result?. Increased acceleration and torque compared to regular plugs.
I just put the Denso Iridium sparks in my 2005 Chevy Colorado Z71. It is a huge upgrade from the platinum that came from the factory. I'm on a Chevy Colorado forum and almost all of the members rave about these spark plugs so I gave them a try and will never run a different plug.