@joelster hit it. That motor is no slouch hitting those engine dyno numbers at such a low SCR.
Here's how I'm figuring it. Let's use a conservative 75% efficiency from the supercharger. At 10 PSI you're adding 51% of atmosphere to the motor (10 PSI / 14.7 bar * .75 efficiency). So say a rough output of 151%. That when coupled with the 490/490 puts you at about 740 on an engine dyno with the blower. Now let's get conservative again and say that the drivetrain is eating up a solid 25% of the engine power. You're conservatively and potentially looking at about 555 at the tires. I think based off this above (blowers are usually in the 80 to 85% efficiency range and drivetrains with higher stalls and autos are typically 18 to 20%) and the conservative numbers you can definitely see higher.
