I'm familiar with both LS1.com and LS1TECH.com, but I can tell you that those motors are running full bolt-on's. It may be internally stock, but they have been modified. It should come as no surprise seeing as how the LS1 is the most responsive to bolt-on's. Please don't tell me to view the forum dedicated to a car that I own again. I'm well aware of how they handle and the performance that can be derived from adding parts.