My absolute favorite go-fast trick was posted on this site a few years ago. A guy had it "all knowed up". He was going to weld a shaft onto the front of the fan pulley and extend it out through the grill and run a big propeller on the front of the truck, this would of course necessitate a "rotating seal" through the radiator, intercooler etc. , but he had that all figured out too. He was also going to mount smaller propellers on the driveshaft for good measure!