You are right Jester,I think Dyno tuning is a great tool for getting the most H.P. out of an engine.
Sure beats running up n down the road to adjust stuff.
The number at the rear wheels is like you say always lower than the FWheel number.
Wow I dont no how many Flywheel H.P. would be needed to put 600 to the ground probably well over a 1000.
Some of you guys r lucky to live in a place where there is dynos available,
I moved here from Miami n its culture shock for Hotrodding