Have you seen this 3/S swanny?

[Pushit2.0]

That DD dyno should be able to graph 2400awhp, and steady state 1200awhp. For cars making over 400awhp we have another traction bar to put over the front controll arms and cars making 500+ we add more straps to hold the car back also, this would keep the car from pulling up on the rollers. It would also depend on ramp rate, gear ratio, tire size, but cars pulling up like that are not safe and will throw dyno numbers off.

~John