What's the most powerful engine you have ever driven?

A 1956 Ford Pickup with a big block 460 bored to 490.. man that thing can get up and go every gear throws you back in the seat... Just the rumble from it can be heard 3 or so streets away...

its not a car but a fishing boat with a worked 350 chev with a nice supercharger on it LOL was awesome as! but i think it scared the fish away LOL

 

For mr it was the XPT as a young apprentice back in the dark ages,
got to 'steer' her on a service mission on the way to Tenterfield. Don't know
the figures, but it hauled ass at 180kph.
In a car it was a HQ monaro with a 454 big block armed with nitros.

 

an Ex-V8 supercar...

3 laps in a 600hp v8 supercar was the fastest thing i've driven! (much to the envy of my friends as they watched)
- But more so the braking and handling/cornering rather than straight out neck-snapping power. - but still very impressive.

Other than that, my 310rwHP Zed is the fastest thing i've driven. But I have an unhealthy love affair with it so I'm not looking for anything with more power atm. lol.