Mike, if you are asking me about chassis dyno's and turbo motors.
Heres what i can tell you. They work for tuning pretty dam well. That includes 4 wheel drive.
In SoKal there are so many factory turbo rice cars and Old School High Horsepower classic cars, We have Dyno shops all over the place. Some good. Some not so good. (Think MAX HP only counts)
Very few of the dyno operators I know give a dam about peak HP. Thats just bragging rights and lets the customer feel they got their money's worth.
These guys are into a balanced interaction between A/F, Ignition, Torque and HP, etc.
It's all about the balance.
In my neck of the woods. Off the top of my head. I can think of 8 chassis dyno shops that are close.
And about 6 engine dyno shops that are within a 45 minute drive on a good day.
Hell there are three within 5 minutes of where I am sitting right now.Thats just the stuff I know about. There's probably many more.
I kinda figure it really doesn't matter what I say anyway. It's all conjecture and perceptions based on my experience.
Some like Blue. Some like Red. Pick your own perceptions and run with it.
Oh... Before I forget.
I still wanna be like you
Clayton