It was on April 5th. I watched it. One of the best shows on Trucks ever. The really glamorized diesel performance mixing in the product placement nicely.
They dynoed a stock Duramax at 194, put on Bully Dog gauges, fuel box, LP, NOS, and exhaust and put her back on the dyno for a 455 (?) hp run. It is now the highest hp on the HorsePower TV dyno.