Best grip score will occur with 911 Turbo, it's the 3rd fastest car in the game, but with the highest handicap. Over 15,000 is possible depending on track.
Best drag score will occur with Camaro SS if you can launch in 5th gear (over 15,000).
LinkYoutube version:
LinkBest Wheelie score occurs by backing up a Willow Springs, where wheelie distance can be over 2030 feet. Video:
LinkRX7 usually best for drift, although many cars can drift well. It also depends on the track. Video of a 240SX with minimal upgrades at Ebisu A:
LinkSpeed - again 911 Turbo is best, over 15,000 also possible depending on track. Video at Nevada C, under 2:50:
Link[Edited by jeffareid, 7/30/2008 12:16:13 AM]