Not be a let downer, but the stock 5.3 in the colorado dyno's at 240hp at the wheels. 300 hp is at the crank. Mine isn't stock either, I'll post a video here in a minute. - - - Updated - - - http://youtu.be/1hoXAO2hjDU Here's a video for you, cammed, stalled, TBSS rear axle swap, still in the process of being finished. This took over a year to complete, I'm pretty sure we can take down a 5.3.