I think the fastest car that I've driven was an Audi turbo quatro coupe.. It was an autherntic Pikes Peak racer and they wernt really selling it, just showing...dont know how I got a demo drive...do remember that I got it up to 60mph in 2nd , and it was a 5 speed.
2md fastest was prolly a BMW 645ci convertable...looked like a Chrysler Sebring..but went like WOW and sounded like a 60's muscle car !!
I was upside down with one hand on the flashlight , one on the Bentley manual and one on the screwdriver and feet in the air ...and you needed to be a contortionist to reach the filter behind the console,,,then getting the glovebox back in and locking ...whew ... mebbe could get it down faster the second time....
I had driven 525's but they seemed gutless, bought a 535 (E34) and Jim C chipped it ...fast and well balanced ,,the 540 is a beast,but doesnt handle quite as well ...When I worked in Washington, I'd floor it on the bridge onramp,,,I set my hi-speed warning chime at 75mph,,,and set it off at abt 2/3 up the ramp, would make abt 90 when it was time to junp on the brakes to merge into traffic