This is all just my opinion...but I think it's marketing.

Whipple makes huge claims for their 3V F150 blowers as well, but I haven't seen anything near what they are claiming, either in-person on a dyno or on dyno sheets that I've seen online.

Put it this way: If Roush makes 445 hp to the wheels, then it's making more than 500 hp at the crank. Which is Ford GT territory.

Don't get me wrong, I'm not trying to knock your setup. In fact I think it's a killer truck that I'd love to own. It's just Roush's power claim that I'm a bit skeptical of.