Past weekend the Corvette Driving Days took place in my hometown. I was able to drive three different Corvettes. C6 Coupé, C6 Convertible and the 505-HP-Z06. As yet the Z06 is the most powerfull car I ever drove (the black one is the Z06):

Sadly to say, since I have only been driving for the past month and a half, and therefore have only driven about 6 different cars, the fastest one I've ever drove was just my driving instructor's 2002 Oldsmobile Alero

Hmm, a lot of the cars I've driven make aproximatly the same amount of power. It was probably a '92 Silverado, but I don't know which engine it had, so it could have been 175 or 210hp. If it was the 175hp version, the most powerfull car I've driven could be a Taurus (2003) I rented, but I don't know which engine that had either, it could be 155 or 200hp.
If I drove the 175hp Silverado and the low-power Taurus, it could also be a rental Pontiac Montana. It had the 3.4l LA1 V6, which made between 170 and 185hp.
Also in the running is my Dad's '89 Pontiac Safari (exactly like this one. I know it had a V8, but I have no idea what kind or how much power.
I think the first car I ever drove (my Dad's Chrysler LeBaron wagon) had a 360cid V8, but it was made in the late 70s, so I wouldn't expect it to have very much horsepower (lots of torque though).

I haven't had the chance to drive anything very powerful yet. The most powerful car I've driven was a Chrysler Sebring 2,7 V6 Convertible which had about 200hp. Second most powerful is a Mazda Xedos 9 2,5 V6 with 170hp.

As some of you already know, I was working at Europe´s biggest dealership for classic Cadillacs over a period of 10 years.

Thus I´ve driven several hundred Cadillacs (1940s - 1990s) and I can´t recall them all. Anyway, the most powerful factory made cars I drove were all the 1970s Fleetwood Eldorados with 8.2 litre and up to 400 hp. I have no idea, how many it were, but I suppose about 30.

The most powerful modified car was an early 80s GMC Vandura with a dragster engine and 600 hp. A friend of mine once owned this van and he NEVER let anybody else drive it - until he once lost his driving licence for a few weeks and wanted to visit his family, which lived about 200 km away from us. Well, he asked me if I could help him next sunday - and I could!

October 2006 I joined "GM The Drive" in Las Vegas and selected a Corvette C6 (6.0 V8, 400 hp) and a Hummer H2 SUT (6.0 V8, 325 hp). The C6 seemed to be "slightly" quicker

And regarding the fastest speed I drove, my current Cadillac CTS achives 238 km/h (148 mph) on the German Autobahn until the speed governor comes.

2003 Ford Expedition

Hmmmm...a few years back at the Auto Show in Motion I got to drive a Corvette, Cadillac CTS-V, and a Chevy SSR pick up all of which had about 400hp. As far as my own cars, I have a low compression '72 Dodge Challenger 340ci with 240hp stock.

I'm still waiting for my friend to let me drive his 427 Shelby Cobra replica with 650hp. I don't want to ask...but maybe I should.

Firebird86 has us all beat! But mine was a worthy contender? 1966 Dodge Coronet 2dr HT,-Factory 426 Hemi!!- Stock,it's a mean car....This one'd been worked on 'just a bit'? Est.500+ HP.Mid 11 sec in 1/4 mile,street legal & was driven to track.(at a time when most cars this fast had to be trailered)(But it wasn't mine...and it was 20+ yrs ago??)

I drove my mom's 2006 Cadillac DTS. 275 BHP and 295 lb-ft. A Northstar 4.6 liter V8. The handling is however, not very tight.