Goes a little further than that

Yes Fooz was supercharged so that makes a big difference BUT having said this, I can take the same car over 5 different dyno's (even if same make and model) and readings will change. Add to this, air temp makes a difference as does how they are mounted on the dyno and even tyre pressures will make a difference.

Remember, Dyno readings are not a matter of who has the biggest ego as they are not really all that accurate. The reason I run a car on a Dyno is to tune that car and get all the spark and AFR's spot on for the full rev and load range. This is what counts not who has the biggest number