Kazuo: Vishnu uses a dynodynamics dyno. They give lower numbers (which internet racers hate) but they are more accurate thany any other dyno.
Here is all the information about why this dyno is the best:
http://www.vishnutuning.com/dynos_dont_lie.htm
http://www.vishnutuning.com/dyno_myth.htm
And a little excel spreadsheet to show the differences between dyno ratings:
http://www.vishnutuning.com/How_Big_...Horsepower.xls
Its up to majority of course, but if you read through that stuff I'm sure youll agree that vishnu's dyno is superior.
Also the other nice thing about vishnu is that they dont just do 3 pulls and take your car off, they will continue to do pulls
untill the reading is consistant. Which means you know exactly how much power youre making, not just how much you average over 3 pulls.