fastest: tie between 2 911 Turbos. One was my ex-boss's car the "atomic frog" (guess color?) and the other belonged to an avid track racer from Maine Porsche club. These drives were a few years apart, hard to tell if one or the other was actually faster. Let's just say there was a lot of gas-pedal mashing, silly accel, grinning and holy ***** sort of conversation, and then panic braking as things came up the road pretty efn fast.
most fun: tie betweeen my 73 911T (how can just 140 hp be so fast n fun?), a student's built Evo rally car at Team O'Neil (the guy actually told me, "OK let's go fir it, so I had to oblige), but the clear winner has to be my dear departed GC rally car (all 195 NA hp of her in 20-some rallies, siiiiiigh.....)